Question

If a current of `1 A` passing through a circuit generates `18 W` of power, what is the resistance of the circuit?

Answer 1

`18\ Omega`

Explanation:

If `R\ \ \Omega` is the electric resistance of the circuit carrying an electric current `I=1\ A` then the power `P` of the circuit is given as

`P=I^2R`

`R=P/I^2`

`=18/1^2`

`=18`

hence the resistance of circuit is `18\ Omega`