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Ac Through a Resistor

Physics · Class 12

In a purely resistive AC circuit, current and voltage are in phase.

P_avg=V_rmsI_rms
P_avg=I_rms²R
V_rms=I_rmsR
φ=0
Power: Suppose: v=V₀sinωt From Ohm's law: i=vR Therefore: i=(V₀R)sinωt or: **i=I₀sinωt
Formula / Key Relation: V_rms=I_rmsR φ=0
A pure resistor creates no phase difference.

Free-body idea — Ac Through a Resistor — original sketch for this lesson (not copied from a textbook).