Question

What is the power in a DC circuit?

Options

• \[P=VI\cos\phi\]

• \[P=VI\]

• \[P=I^2Z\cos\phi\]

• \[P=V_{\mathrm{rms}}I_{\mathrm{rms}}\cos\phi\]

Answer 1

In a DC circuit, power is the product of voltage and current. The phase-angle term used for AC average power is not needed.