Question

calculate the current passing through a bulb rated 60w 240v when itis connected to a 240v power supply

Answer 1

Hey guys  

p =   \frac{{v}^{2} }{r}  

We find the resistance of the bulb

R=V^2/P

R=240×240/60=240×4ohm

Then use OHMs law

V=IR

I=V/R=240/240×4==》0.25A

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Hope it helps....