Previous question Next question. Solved Examples. Oct 10, 2023 · Capacitive reactance is the resistance to current flow in a capacitor, whereas impedance refers to both resistive and reactive components. The part of the impedance that is frequency dependent is called "capacitive reactance" in capacitors and ' 'inductive reactance" in inductors. You only need to know the resistance, the inductance, and the capacitance values connected in series or parallel. The consequences of these two components on circuit performance and mathematical representations are distinct. Such a set of conductors, a capacitor, essentially opposes changes in voltage, or potential difference, across its plates. Solution for (a) Entering the frequency and inductance into Equation XL = 2πf L X L = 2 Apr 28, 2023 · Capacitive reactance is a property of a capacitor that describes how it resists the flow of alternating electrical current. Where, The capacitive reactance is denoted by XC. Hence the frequency of the signal is inversely related to the capacitive reactance of the circuit. Essentially, when an AC voltage is applied to a capacitor, it generates an opposing force that reduces the amount of current that can flow through it. Let's put a capacitor to work to see the relationship between current and voltage. Mar 17, 2024 · Introduction to Filters and Capacitive Reactance. Reactance is different from resistance because reactance is an A capacitor in an AC circuit exhibits a kind of resistance called capacitive reactance, measured in ohms. This value is inversely proportional to the capacitance value and the Aug 28, 2018 · As the name suggests, the inductor-provided opposition is called inductance reactance whereas opposition by the capacitor is called capacitive reactance. While reactance is the measure of how much a circuit reacts against change in current over time, susceptance is the measure of how much a circuit is susceptible to conducting a changing current. Please note that the last term sin(ωt + π/2) sin. They exhibit capacitive reactance, which influences the opposition to current flow in the circuit. The resistance of a circuit like this can be made so small that it has a negligible effect compared with the capacitor, and so we can assume negligible resistance. file 00583 Question 8 At what frequency does a 33 µF capacitor have 20 Ω of reactance? Write the formula for Reactance is the impedance presented by a capacitor or inductor. Notice that here, the reactance is "one divided by" the frequency and the capacitance - this results in values of impedance that go down with frequency and capacitance. It is inversely proportional to the signal frequency & capacitance. It is denoted by the symbol XC and is measured in ohms (Ω). Q. First, the capacitance, 80 Mf, is changed to farads by dividing 80 by 1,000,000, since 1 million microfarads is equal to 1 farad. 1 shows a graph of capacitive reactance against frequency for a given value of capacitor, with capacitive reactance (X C) inversly proportional to frequency, (X C reducing as frequency . Recall that inductive reactance is expressed mathematically as. where X C is the capacitive reactance and R is the soon-to-be-defined term of ESR. Mar 24, 2024 · Capacitive reactance is the property of a capacitor which opposes the flow of current in AC circuits. The capacitor seems to pass and alternating current. Feb 1, 2024 · Q: What is capacitive reactance? A: Capacitive reactance is the opposition that a capacitor presents to the flow of alternating current. This calculation works by clicking Dec 27, 2022 · Capacitive reactance and electrical resistance are electrical properties that oppose current flow. Jun 25, 2020 · This means that capacitive reactance, which is equal to the impedance of the circuit given by the equation: Z = V / I, has been reduced to half its original value. Since current flows easily for a capacitor that is near the discharged state increasing the capacitance reduces the opposition to current flow. The capacitive reactance can be defined as; in an AC circuit, the opposition offered from a capacitor to the ac current supply. 2. This all-in-one online Capacitive Reactance Calculator performs calculations using the formula that relates the frequency of alternating current and the capacitance of an electrical circuit to its reactance. The capacitance of a capacitor is 8µF. May 7, 2024 · Capacitor Reactance Demystified. Step 2: Write the formula and put the given values in it. Reactance is measured in ohms (Ω). Q is inversely proportional to the amount of energy dissipated in the capacitor. Calculate the reactance of capacitor value of a 110nF capacitor at a frequency of 5kHz and again at a frequency of 10kHz. f f is the frequency of the power supply; C. Remember that an inductive reactance translates into a positive imaginary impedance (or an impedance at +90 o), while a capacitive reactance translates into a negative imaginary impedance (impedance at -90 o). Electrical filter is a circuit, designed to reject all unwanted frequency components of an electrical signal and allows only desired frequencies. AC Capacitance Impedance: The impedance (Z), is the total opposition to the flow of alternating current (AC) in a circuit. Figure 3. This quotient equals 0. 00μF 5. To low-frequency signals, capacitors offer a lot of resistance, so Jan 26, 2024 · In electrical engineering, capacitive reactance is used to measure the opposition that a capacitor offers to the alternating current flowing through it. Capacitive reactance Reactance, denoted X , is a form of opposition that electronic components exhibit to the passage of alternating current (alternating current) because of capacitance or inductance. 000080 farad. There are two kinds — capacitive and inductive. As frequency is changed to 50, 100, 1000, and 5000 Hz, each reactance is computed using the formula for capacitive reactance (capacitor impedance). The quantity X C X C is known as the capacitive reactance of the capacitor, or the opposition of a capacitor to a change in current. Pure resistive AC circuit: voltage and current are in phase. The unit of Capacitive Reactance is Ohms like resistance. 5µF capacitor is discharged through a 10 millihenry inductor. 5258 Ω ∠ -90°, or 0 - j26. Reactance (symbol X) is a measure of the opposition of capacitance and inductance to current. View the full answer Answer. The two forms of the capacitors's i - v equation are: i = C d v d t v = 1 C ∫ 0 T i d t + v 0. , 100 ohms of resistance in series with 50 ohms of capacitive reactance; and Z = 600∠45∘Ω Z = 600 ∠ 45 The reactance of a 0. Here are some of its notable features: User-Friendly Interface: The calculator boasts an intuitive and user-friendly interface, making it accessible to both beginners and experienced engineers. Write the formula for calculating capacitive reactance (X C), and solve for current through the capacitor. It depends inversely on the frequency of the ac source—high frequency leads to low capacitive Mar 21, 2024 · Capacitive reactance is essential for understanding the behavior of capacitors in AC circuits, as it influences the overall impedance (Z) of a circuit. 2. Because the resistor’s resistance is a real number (5 Ω ∠ 0°, or 5 + j0 Ω), and the capacitor’s reactance is an imaginary number (26. Figure \(\PageIndex{4}\): (a) A capacitor connected across an ac generator. There are two types of reactance: capacitive reactance (Xc) and inductive reactance (X L). Capacitive Reactance Defined. What is the capacitive reactance of a capacitor of 5µF at a frequency of (1) 50 Hz and (2) 20KHZ? Explain the term inductive reactance. The unit Ohm () is used for measuring reactance. To low-frequency signals, capacitors offer a lot of resistance, so Reactance is the energy storage and discharge from capacitors and inductors, so no power is converted to another form. where is X c is capacitive reactance in ohms, f is frequency in hertz and C is capacitance in farads. Examples include Z = 100 − j50Ω Z = 100 − j 50 Ω, i. The above equation gives you the reactance of a capacitor. It is inversely proportional to the frequency and capacitance of the circuit. At lower frequencies, reactance is larger, impeding current flow, so the capacitor charges and discharges slowly. The capacitive reactance of a capacitor linked in a circuit with capacitance C and an AC power will be given as: Xc=1/2πfc. Equivalent Series Resistance Reactance is known as the opposition that is present against the movement of alternating current in an inductor or capacitor due to inductance or capacitance respectively. If one were tasked with determining the total effect of several parallel-connected, pure reactances, one could convert each reactance (X) to a Note, that for a capacitor \$ C \$ the reactance \$ X = - \frac {1}{Y} \$, where \$ Y \$ = the susceptance of the \$ C \$. This can be visualized as a series combination of a resistor and either a capacitor or an inductor. The reactance and impedance of a capacitor are respectively = = = = = where j is the imaginary unit and ω is the angular frequency of the sinusoidal signal. The impedance, Z of the circuit is given by the expression √R 2 + X 2 c, where R is the resistance and Xc is the capacitive reactance. An RLC series circuit has a 40. Capacitors and Capacitive Reactance Consider the capacitor connected directly to an AC voltage source as shown in Figure 23. At f=0, X C →+∞, which means that the capacitor behaves as an open circuit at low Capacitive reactance (abbreviated X C) is a frequency dependent term. The -j term accounts for the 90-degree phase shift between voltage and current that occurs in a purely capacitive circuit. But the two phenomena are different in important ways, and they can vary Jun 1, 2024 · This RLC impedance calculator will help you to determine the impedance formula for RLC, phase difference, and Q of RLC circuit for a given sinusoidal signal frequency. In our tutorials about Capacitors in AC Circuits, we saw that in a purely capacitive circuit, the current I C “LEADS” the voltage by 90 o. The relationship between capacitive reactance and frequency is as shown below. To calculate the capacitive reactance you must initially multiply 2xπxfxC and then divide the result by 1. Reactance varies with the frequency of the electrical signal. 3. Like resistance, which determines the voltage across a resistor, capacitive reactance is measured in ohms. You can enter the values of any two known parameters in the input fields of this calculator and find the Remember that an inductive reactance translates into a positive imaginary impedance (or an impedance at +90°), while a capacitive reactance translates into a negative imaginary impedance (impedance at -90°). Capacitive reactance can be calculated using this formula: XC = 1/(2πfC) Capacitive reactance is the opposition by a capacitor to the flow of alternating current. Remember the current will lead the voltage by 90 degrees Mar 8, 2024 · V = √ (I x R) 2 + (I x X C) 2. The inductance of a coil is 0. 0μF capacitor placed in an ac circuit driven at a frequency of f =683kHz ? This frequency dependent opposition to current flow in a capacitor is called CAPACITIVE REACTANCE (X C ). The capacitive reactance is found directly from the expression in X C = 1 2π fC X C = 1 2π fC. 1 microfarads which equals 25 ohms. 4. For low frequencies, the capacitor acts like a resistor with a very high resistance. Like resistance it is measured in ohms, but reactance is more complex than resistance because its value depends on the frequency (f) of the electrical signal passing through the capacitor as well as on the capacitance, C. The − j phase indicates that the AC voltage V = ZI lags the AC current by 90°: the positive current phase corresponds to increasing voltage as the capacitor charges; zero current Jan 9, 2024 · As frequency increases, reactance decreases, allowing more AC to flow through the capacitor. The main applications of the filters are at audio equalizers and May 22, 2022 · The capacitive reactance may be computed via the formula: \[X_C = -j \frac{1}{2 \pi fC} \nonumber \] The magnitude of capacitive reactance may be determined experimentally by feeding a capacitor a known current, measuring the resulting voltage, and dividing the two, following Ohm’s law. 0 Ω resistor, a 3. The formula for capacitive reactance is: Fig 6. Capacitors store energy on their conductive plates in the form of an electrical charge. Capacitive reactance is the opposition that a capacitor offers to alternating current due to its phase-shifted storage and release of energy in its electric field. Increasing the frequency also decreases the opposition offered by a capacitor. Dissipation Factor . This reactance is dependent on the frequency of the alternating current (see equation above). It is a lot easier to design and construct a May 22, 2022 · Impedance is a mixture of resistance and reactance, and is denoted by Z Z. We need some extra energy over capacitive reactance to charge up a capacitor in the circuit. – Andy aka. Calculate current and/or voltage in simple inductive, capacitive, and resistive circuits. Impedance is the overall opposition to current flow in an AC circuit, resulting in the ‘apparent’ power loss. 46 . There are predominantly two types of reactances – inductive and capacitive reactance. If not you need to make this clear. 1: Calculate the capacitive reactance value of a 220 nF, capacitor at a frequency of 1 kHz and again at a frequency of 20 kHz. Cite. 8 amps. The combined effect of resistance R R, inductive reactance X L X L, and capacitive reactance X C X C is defined to be impedance, an AC analogue to resistance in a DC circuit. Calculating Capacitive Reactance and then Current (a) Calculate the capacitive reactance of a 5. A capacitor rated at 2. Reactance Calculator. The capacitive reactance equals 1,000,000 divided by 6. Notice how the reactance on the graph approaches zero as the frequency heads toward infinity. The capacitive reactance will be studied using the circuit shown in Fig. Reactance, X. It is also measured in “Ohms”. Mar 27, 2019 · Capacitive reactance (symbol X C) is a measure of a capacitor’s opposition to AC (alternating current). Mar 15, 2019 at 11:33. The im- pedance of a capacitor or an inductor changes as the frequency of operation changes. Substituting the expression for I pk from equation 6–5h into equation 6–5i produces the following result. 0 kHz AC voltages are applied. In reactance. To determine the current flow in the wire, first find the capacitive reactance of the capacitor. The cheap, common, ones use capacitance and are better at detecting voltage than they are non-voltage, especially if you are wearing gloves. Oct 18, 2012 · Here, C is the capacitance of the cap in farads, "2pi" and "f" are the same as above, and "X-sub-C" is the capacitive reactance in ohms. All components possess impedance, and because of this universal quality, it makes sense to translate all component values (resistance, inductance, capacitance) into common terms of impedance as the first step in analyzing an AC circuit. Capacitive reactance can be calculated using this formula: XC = 1/(2πfC) Nov 19, 2019 · Because a capacitor is made of two (or more) conductors separated from each other by an insulator, capacitive reactance is a measure of a capacitor’s opposition to change in voltage or AC voltage flow. Resistance, of course, is still regarded as a purely “real” impedance (polar angle of 0°): Jul 20, 2018 · Step 2: Find the Capacitive Reactance. This means that they offer different resistances to signals of differing frequencies. The opposition to current flow through an AC Capacitor is called Capacitive Reactance and which itself is inversely proportional to the supply frequency. (a) Find the circuit’s impedance at 60. Many circuits also contain capacitors and inductors, in addition to resistors and an AC voltage source. 80 H and its resistance is 50Ω. Unlike resistance, which remains constant regardless of frequency, capacitive reactance varies with the frequency of the AC signal. Inductive Reactance which is given the symbol X L, is the property in an AC circuit which opposes the change in the current. Figure the inductive reactance and admittance, and capacitive reactance and admittance using DigiKey's easy-to-use reactance calculator AC Resistor Circuits (Capacitive) PDF Version. Reactance is also expressed in ohms. In addition, the reactance of a capacitor is inversely Sep 12, 2022 · The quantity \(X_C\) is known as the capacitive reactance of the capacitor, or the opposition of a capacitor to a change in current. Unlike resistance in direct current (DC) circuits, which dissipates energy, capacitive reactance results from the capacitor’s ability to store and release energy Sep 12, 2022 · The capacitance C C of a capacitor is defined as the ratio of the maximum charge Q Q that can be stored in a capacitor to the applied voltage V V across its plates. In other words, capacitance is the largest amount of charge per volt that can be stored on the device: C = Q V (8. C = 220 nF = 220 ×10−9F. 1, using R = 25 Ω set the voltage at a peak value of 4 V. It is important to consider when choosing a pulse capacitor because it determines the capacitor's ability to filter out unwanted high frequency noise and provide a stable output. Lower reactance can mean either less inductance or more capacitance. Strategy. C is the scale factor for the relationship between i Perfect inductors and perfect capacitors possess reactance but no resistance. In other words a filter is a circuit which allows only a certain band of frequencies. Find the frequency of discharge. The capacitance is shown by the letter C. Jul 11, 2021 · Calculate inductive and capacitive reactance. Both are denoted by the capital letter “X” with a subscript of “L” for the inductor and “C” for the capacitor. We can quickly obtain the capacitive reactance of a capacitor with the capacitive reactance formula: X = \frac {1} {2 \pi f C} X = 2πf C 1. The inverse of Q is the dissipation factor (tan(δ)). Figure 2. In some respects, reactance is like an AC counterpart of DC (direct current) resistance . 1) C = Q V. As with inductors, the ideal capacitor is a purely reactive device, containing absolutely zero resistive (power dissipative) effects. Solution for (a) Entering the frequency and inductance into Equation XL = 2πf L X L = 2 Keep in mind, however, that a capacitor stores and discharges electric energy, whereas a resistor dissipates it. Schematic of the circuit used to study capacitive reactance. Aug 24, 2022 · How to calculate capacitive reactance. C = 80 F. Capacitive Reactance Calculator. Unlock. 002010624 and the result is divided as follows: 1 / 0. Capacitive reactance, denoted by 𝑋𝐶XC , is a measure of a capacitor’s opposition to alternating current (AC). Reactive loads result in ‘reactive’ power. At a frequency of 1 kHz: we have, f = 1 kHz = 1000 Hz. The expression takes into consideration the rate of change of current in the circuit in terms of frequency (f) and the size of the inductor in terms of its value (L). This depends on the frequency of the AC voltage, and is given by: Xc = 1/wC. (6–5i) The values of capacitive voltage and current may be specified in peak terms so that. t. 0Ω 40. The frequency dependent impedance of a capacitor is called capacitive reactance. Capacitive reactance is how the impedance (or resistance) of a capacitor changes in regard to the frequency of the signal passing through it. The inductive reactance, XL, of a coil is an indication of the ability of a coil to produce self-induced voltage. Solution: Here: ƒ is the frequency in Hertz and C is the capacitance in Farads. Solution. As Oct 22, 2022 · This video is an in-depth look at reactance and capacitive reactance, including the differences between resistance and capacitive reactance, and the formula Mar 23, 2017 · The mathematical expression for capacitive reactance is given by the following equation: Xc = 1 / (2πfC) Where: Xc = capacitive reactance (Ω) f = frequency of the current (Hz) C = capacitance of the circuit (Farads) π = pi (approximately 3. e. Transcribed image text: What is the capacitive reactance X C of a 80. The Capacitive Reactance Calculator is a valuable online tool that simplifies the process of determining capacitive reactance in AC circuits. Let's apply the same thing to an inductor with the same voltage source: VS = Vm sin(ωt) V S = V m sin. Like resistance, reactance is measured in Ohm’s but is given the symbol X to distinguish it from a purely resistive R value and as the component in question is a capacitor, the reactance of a capacitor is called Capacitive Reactance, ( X C) which is measured in Ohms. 1 μF capacitor as the frequency is varied can be seen in Figure 3. A capacitor resists the changes within the potential difference otherwise the voltage across its two plates. The total reactance (X) is the difference between Capacitive reactance (symbol X C) is a measure of a capacitor's opposition to AC (alternating current). Reactance is also inversely proportional to the value of The capacitance of the capacitor is C = 80 μ F = 80 × 10 − 6 F. Q: What are the units of capacitive reactance? A: Capacitive reactance is measured in ohms (ΩΩ). Apr 2, 2024 · AC Capacitance and Capacitive Reactance. We can use this like a resistance (because, really, it is a resistance) in an equation of the form V = IR to get the voltage across the capacitor: Jul 26, 2022 · Reactance at frequency is a measure of a capacitor's ability to block or pass AC signals at a specific frequency. 14) The derivation of this equation is based on the relationship between the voltage and the current in Calculate inductive and capacitive reactance. 00 μ F capacitor. 1) (8. 1 : Calculating Impedance and Current. Capacitors, unlike resistors, are reactive devices. A 0. You can interpret the name 'RLC circuit' to mean a circuit Aug 23, 2021 · So the capacitive reactance is, XC = 1 ωC X C = 1 ω C. As opposition to the inductors, we can understand through this equation that the opposition to an AC voltage decreases inversely with an increase of the frequency. Capacitor AC Response. Aug 17, 2023 · Capacitors in AC circuits are key components that contribute to the behavior of electrical systems. Step 1: Identify the values. Impedance is a complex quantity that includes both resistive and reactive components, where the reactive part consists of capacitive and inductive reactance. The reactance of capacitor of the capacitor is inversely proportional to the frequency. It determines the voltage drop across the capacitor in an AC circuit . We have seen how capacitors and inductors respond to DC voltage when it is switched on and off. f = 200 Hz. e. What is the frequency of the applied signal? There are 2 steps to solve this one. Example: a capacitor of 320nF, has a frequency of 1kHz, which will be the capacitive reactance, to find it you must multiply 2x320xπx10 ^ -9 × 1000 = 0. Impedance is the Pythagorean sum of resistance and reactance. 5258 Ω), the combined effect of the two components will be an opposition to current equal to the complex sum of the two numbers. 00 mH inductor, and a 5. In fact, at direct currents where the frequency is zero, the capacitor acts like an open switch. Reactance is symbolized by the capital letter “X” and is measured in ohms just like resistance (R). There are 'field' sending types for <600V but they are common for MV systems where meter lead contact is not often practical. 1 23. The capacitive reactance satisfies the following Equation 3: eq 3 : Reactance of a capacitor. Understanding how capacitors behave in series and parallel connections is crucial for analyzing the circuit's impedance and current characteristics At the higher frequency, its reactance is small and the current is large. Like resistance it is measured in ohms, but reactance is more complex than resistance because its value depends on the frequency (f) of the signal passing through the capacitor. Capacitors can be used to filter out low frequencies. . Thus applying the formula: XC = 1 Capacitor Quirks. 36 Ohm. In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit. It depends inversely on the frequency of the ac source—high frequency leads to low capacitive reactance. The capacitance of a capacitor determines the amount of charging a capacitor can achieve. At higher frequencies, reactance is smaller, so the capacitor charges and discharges rapidly. The inductive reactance is found directly from the expression XL = 2πf L X L = 2 π f L. It is represented with symbol Xc and measured in Ohms same as like resistance. Use this tool to calculate the reactance or admittance magnitude of an inductor or capacitor at a specified frequency. (b) What is the rms current if the applied rms voltage is 120 V? Strategy. ( ω t + π / 2) indicates that the current is a sine wave leading the voltage ( Vs V s above) by 90 degrees. Now use ohm's law and divide 120 volts by 25 ohms which equals 4. Find the capacitive reactance and the current flow. It is generally represented through ‘Xc Reactance is expressed as an ordinary number with the unit ohms, whereas the impedance of a capacitor is the reactance multiplied by -j, i. Share. [1] Quantitatively, the impedance of a two-terminal circuit element is the ratio of the complex representation of the sinusoidal voltage between its terminals, to the complex Feb 20, 2022 · Example 23. Add a comment. You know that the voltage across a capacitor lags the current because the current must flow to build up the charge, and the voltage is proportional to that charge which is built up on the capacitor plates. , Z = -jX. Thus, ESR rating of a capacitor is inversely related to its quality. edited Dec 21, 2021 at 12:55. However, capacitors have the virtue of generally being purer reactive components than inductors. Stated in Ohm's Law format. Solved Problems on Capacitive Reactance Problem No. Capacitors favor change, whereas inductors oppose change. C is the capacitance, a physical property of the capacitor. A capacitor's opposition to alternating current is called its reactance. Procedure Inductor voltage vs frequency for an RL circuit With the circuit of Fig. Reactance changes with a change in Capacitive reactance is how the impedance (or resistance) of a capacitor changes in regard to the frequency of the signal passing through it. Jun 2, 2024 · There are several type of contact less sensors. Note also, that the change in sign means the phase has flipped too and that is as it should be: because on a capacitor its voltage over it is 90 degrees lagging behind the current through it. However, they differ because electrical resistance opposes current flow (AC or DC) in conductors and resistors, whereas capacitive reactance applies to capacitors and is specific to AC power. Current, voltage, and impedance in an RLC circuit are related by an AC version of Ohm’s law: How to calculate capacitive reactance? Example: Find the capacitive reactance of a capacitor if the capacitance is 80 microfarads and the frequency is 200 hertz. 0 kHz, noting that these frequencies and the values for L L and C C are the same as in [link] and [link]. In DC circuits, capacitors block current due The capacitor is one of the ideal circuit elements. 28 times 60 hertz times 106. In the real world, of course, nothing is so perfect. If we were to plot the current and voltage for a very simple AC circuit consisting of a source and a resistor, (figure above) it would look something like this: (figure below) Voltage and current “in phase” for resistive circuit. Do you understand how inductors and capacitors work. Capacitive reactance, on the other hand, is associated with the changing electric field between two conducting surfaces (plates) separated from each other by an insulating medium. The frequency of the AC power source is f. Mar 19, 2024 · Capacitive reactance is the opposition presented by a capacitor to the flow of alternating current (AC) in a circuit. 00 µF capacitor when 60. 1. where: f. The measure of the opposition to alternating current by the capacitor is called Capacitive Reactance. Once XL X L has been found at each frequency, Ohm’s law as stated in the Equation I = V /XL I = V / X L can be used to find the current at each frequency. X c = 1/2πfC. Capacitors impede low frequencies the most, since low frequency allows them time to become charged and stop the current. It is calculated using the formula X_C = 1/ (2? f*C), where X_C is capacitive reactance, f is the frequency of the current, and C is the capacitance of the capacitor. 2 microfarads is subjected to a sinusoidal AC voltage of 24 volts RMS, at a frequency of 60 hertz. 00064 = 497. The next step is to express all resistances and reactances in a mathematically common form: impedance. Solution: To find capacitive reactance, the equation Xc = 1/ (2 p f C) is used. 0 Hz and 10. The capacitive reactance of a 44 micro farad capacitor in an AC circuit is 6*10^2 ohms. kg sf rp xf lc lu tg ss md kz