Suppose we get out our trusty true RMS digital multimeter an

Suppose we get out our trusty true RMS digital multimeter and measure V_RMS = 10 volts and I_RMS = 2 ma. Could we then calculate the average power being delivered to N. Why

Solution

CASE1

ANS:NO

Since the network consists of reactive components like inductor and capacitor,there is chance of taking both active and reactive power from supply if circuit is NOT UNDER RESONACE CONDITION.

Also to calculate average power POWER FACTOR is required.Average power=Vrms*Irms*pf

CASE 2

ANS :yes

If circuit is under RESONANCE CONDITION at particular Frequency,then power taken from source is only active or average power.

Since power factor is unity.Average power=Vrms*Irms