Question

A series R-L-C circuit is connected to a 70.0 Hz ac source that has Vrms = 80.0 V . The circuit has a resistance of 80.0 Ω and an impedance of 102 Ω at this frequency. What average power is delivered to the circuit by the source?

Answer 1

62.7 VA

Step-by-step explanation:

The apparent power (power supplied by the source) of an AC circuit is determined by

`S = ((Vrms)^2)/(Z)`

The impedance(Z) depends on the frequency, but in this case it is given to us that it is 102 ohms at this frequency.

So:

`S = ((80 V)^2)/(102 \Omega) = 62.7 VA`