Question
Sat January 19, 2013 By: Sowmya
 

an ac voltage given by v=280sin50pi*t is connected across a pure resistor of 40 ohms. find the frequency of the source and rms current through the resistor.

Expert Reply
Tue January 22, 2013
comparing with the general expression of voltage, V = Vo Sin ?t
thus frequency of source, ? = 50*pi
current, I = V/R = 7 Sin ?t
 
thus the rms current, Irms = average of I2
thus Irms = Im / sqrt(2) = 0.707 Im = 0.707*7 = 4.949
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