A 25Ω resistor is wired directly across a 120-Vac source. What happens to the time-average power,...
A 25Ω resistor is wired directly across a 120-Vac source. What happens to the time-average power, rms voltage, and rms current when the resistor’s value is changed to 50 Ω?
Homework Answers
When we change resistance by 50Ohm then Vrms will remain same but Irms and Pavg will change as follows
Vrms = Vo/Sqrt(2) = 120/1.414 = 84.86 V
Irms = Vrms / R = 84.86/ 50 = 1.697 A
Pavg = Vrms x Irms = 144.007 Watt
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