Resistance 7503

The resistance of a 40W light bulb is 10 Ohms. What voltage source is connected to it? What current is flowing through it?

Correct answer:

U =  20 V
I =  2 A

Step-by-step explanation:

P=40 W R=10 Ω  P = U2/R  U=P R=40 10=20 V
I=U/R=20/10=2 A

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