What component is NOT typically included when calculating impedance in a circuit?

When calculating impedance in a circuit, it is essential to consider the factors that contribute to the total opposition to alternating current (AC). Impedance is a combination of resistance and reactance, which includes both capacitive and inductive components.

Capacitive reactance represents the opposition that a capacitor offers due to its ability to store and release energy in the form of an electric field. Inductive reactance, on the other hand, is related to the opposition offered by inductors, which store energy in a magnetic field. The resistive load represents the actual resistance in the circuit that converts electrical energy into heat or work.

Voltage measurement, while crucial for understanding the performance of a circuit and determining current flow when used alongside Ohm's law, does not directly contribute to the impedance calculation itself. Impedance focuses primarily on how resistance and reactance interact within the circuit, rather than the voltage or the results of measurements taken in that circuit. Thus, it is correct to say that voltage measurement is not typically included when calculating impedance in a circuit.