The impedance is normally denoted by English letter Z. If there is AC, look also at the power factor PF = cos φ and φ = power factor angle (phase angle) between voltage and amperage. Where R is the value of circuit resistance and X is the value of circuit reactance. The value of impedance is represented as. The impedance is measured in ohms and can include resistance (R), inductive reactance (XL) and capacitive reactance (XC). In the case of impedance, an inductor resists changes to the current and the capacitor resists changes to the voltage. Impedance reduces to resistance in circuits carrying steady direct current. Calculating Your Capacitor Impedance To calculate the impedance of our capacitor, you can use the formula below. The key difference between resistance and impedance … The magnitude of the impedance Z of a circuit is equal to the maximum value of the potential difference, or voltage, V (volts) across the circuit, divided by the maximum value of the current I (amperes) through the circuit, or … The formula is: = ∗, where V is the voltage, R is the resistance, and I is the current. Example Calculation: Calculate the impedance when the resistance is 0.6 ohms and the inductive reactance is 0.4 ohms. Here, XC is the total impedance that you’ll get, which is measured in Ohms (Ω). Power Formula 1 – Electrical power equation: Power P = I × V = R × I2 = V2 ⁄ R where power P is in watts, voltage V is in volts and current I is in amperes (DC). Simply plug in the values and solve for Z. So, the equation becomes: Z 2 =R 2 +X L2. Impedance matching is defined as the process of designing the input impedance and output impedance of an electrical load to minimize the signal reflection or maximize the power transfer of the load. Formula for the calculation of impedance: The electrical impedance (Z), is the total opposition that a circuit presents to the alternating current. f is the frequency of the signal through your capacitor, and … When this equation is rewritten to solve for Z, the impedance equation is produced in the form presented . In the AC circuit, the cumulative effect of reactance and resistance is termed as impedance.