Which equation is the standard phasor form of Ohm's law connecting voltage, current, and impedance?

• A. V = I Z
• B. V = I / Z
• C. V = Z / I
• D. I = V R

Answer: (A)

In AC analysis, Ohm’s law in phasor form links voltage, current, and impedance as V = I Z. Here, V, I, and Z are phasors, with Z representing both resistance and reactance in a single complex quantity. Multiplying the current by impedance gives the voltage with the correct magnitude and phase shift, so this is the conventional way to express the relationship. The other options either place impedance in the wrong position or use resistance instead of impedance, which doesn’t capture the reactive part. Writing I = V / Z is mathematically a rearrangement of the same relationship, but the standard form is V = I Z.