The graph shows the current versus the voltage in a driven RLC circuit at a fixed frequency. The arrow indicates the direction that this curve is drawn as time progresses. In this plot, the

Engineering

Physics

AC Circuit Analysis

Question

Current and voltage are in phase

Current lags the voltage by about 90 degrees

Current leads the voltage by about 90 degrees

Current and voltage are 180 degrees out of phase

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$i = i_{0} \cos θ = i_{0} \sin (ωt + \frac{π}{2})$
v = v₀ sinθ = v₀ sinωt
so current leads the voltage by 90°

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