Question Detail

In an A.C. circuit:- Resistors dissipate real power, but inductors and capacitors (reactive elements) do not dissipate average real power; they store and release energy. So, A is false.- Apparent power (S) is the total power delivered to a circuit, comprising both real power (P) and reactive power (Q). Both resistive and reactive elements contribute to apparent power. So, B is false.- Real power (P) in an AC circuit is given by P = V_rms * I_rms * cos(φ), where φ is the phase angle. This can also be expressed in terms of the real part of the impedance (resistance, R) as P = I_rms² * R. Since impedance Z = R + jX, power is indeed dependent on the impedance (specifically its resistive component). So, C is true.- The power factor (cos(φ)) for a purely resistive element is 1 (since φ=0°), not zero. For a purely reactive element, the power factor is zero. So, D is false.