00:01
Hi there, so for this problem we have an all -erc series circuit that is connected to an ac circuit with a frequency that is 120 hertz and that it has an rms potential that is equal to 80 volts.
00:24
Now the circuit has a resistance that is given and that resistance is equal to 75 oms.
00:32
And an impudence at this frequency, and that impedance is equal to, well, the impedance is labeled as seed, and that is equal to 105 hertz, um, sorry.
00:57
So the question is, what is the average power delivered to the circuit by this source? now, first of all, we know that the average power is defined as the average power rms potential times the rms current.
01:12
This times the cosine of the phase.
01:17
Now the rms current can be determined by divided the rms potential divided by the impedance, okay? then the cosine of the phase for this is the resistance divided by the impedance.
01:43
So first of all, what we need to determine is the rms current.
01:48
So that will be the 80 volts that we are given for the potential divided by the 105 oms that we are given for the impedance.
01:59
So that will be given 0 .700 and 62 amperors...