Question

A lamp rated hundred watt at 2:20 volt is connected to the main electric supply what amount of current is drawn from the supply if the voltages to 20 volt what is its resistance

Answer 1

P=100W 
V=220v
i.​P=VI
I=P/V
I=100/220
I=0.4A
ii.​P=V^2/R 
R=V^2/P
R=220*220/100
R=484ohm 


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