The term that describes the combined resistive forces in an AC circuit is __________.

The term that describes the combined resistive forces in an AC circuit is __________.

• A. Admittance
• B. Reactance
• C. Phase angle
• D. Impedance

Answer: (D)

In AC circuits, the total opposition to current is called impedance. It combines resistance (which dissipates energy as heat) and reactance (which stores energy in magnetic and electric fields) into one quantity. Impedance is a complex value Z = R + jX, where the magnitude is |Z| = sqrt(R^2 + X^2) and the phase angle φ = arctan(X/R) tells you how much the current lags or leads the voltage. This is why impedance is the best description of the combined resistive forces in an AC circuit. Admittance is the reciprocal of impedance and describes how easily current flows, not the total opposition. Reactance is the imaginary part that causes phase shift but doesn’t account for the resistive part. Phase angle is the angle itself, related to impedance, but it’s not the complete measure of opposition.

In AC circuits, the total opposition to current is called impedance. It combines resistance (which dissipates energy as heat) and reactance (which stores energy in magnetic and electric fields) into one quantity. Impedance is a complex value Z = R + jX, where the magnitude is |Z| = sqrt(R^2 + X^2) and the phase angle φ = arctan(X/R) tells you how much the current lags or leads the voltage. This is why impedance is the best description of the combined resistive forces in an AC circuit.

Admittance is the reciprocal of impedance and describes how easily current flows, not the total opposition. Reactance is the imaginary part that causes phase shift but doesn’t account for the resistive part. Phase angle is the angle itself, related to impedance, but it’s not the complete measure of opposition.