Question

A voltage source of 20sin pi t volt is connected across a 5kohm resistor Find the current through the resistor and power dissipated

Answer 1

Explanation:

V rms = 20/√2 v

V rms = I rms x R

I rms = V rms / R

= 20 / ( √2 x 5 x 10³)

= 4 / (√2 x 10³)

= 2 √2 x 10^-3 A

power = V rms x I rms = 20/√2 x 2 √2 x 10^-3

= 40 x 10^-3 W