Look but don't touch
Electricity and Magnetism
Level
1
How much current in Amperes flows through a 60 W lightbulb if it is plugged into a 120 Volt wall socket?
The answer is 0.5.
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1 solution
From Joule's law of Heating: H = I 2 R t From Ohm's law: V = I R Combining both the equations. We have: H = I V t t H = V I P = V I 6 0 = 1 2 0 I I = 0 . 5