8–90 AC Voltage Measurement An ac voltmeter measurement indicates the amplitude of a sinusoid and not its phase angle. The magnitude and phase can be inferred by making several measurements and using KVL. For example, Figure P8–90 shows a relay coil of unknown resistance and inductance. The following ac voltmeter readings are taken with the circuit operating in the sinusoidal steady state at f =60Hz : jVSj=24V, jV1j=10V; and jV2j = 18 V. Find R and L.

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Vs + I 200 ww +V- Relay coil + L V2 R FIGURE P8-90