Question

A charge of `35 C` passes through a circuit every `5 s`. If the circuit can generate `98 W` of power, what is the circuit's resistance?

Answer 1

The circuit's resistance is `2` ohms.

Explanation:

As a charge of `35C` passes through a circuit every `5s`

the current is `35/5=7` amperes.

Power of a resistance `R` through which a current of `I` amperes is passing is `I^2xxR` watts.

Hence `7^2xxR=98`

and `I=98/49=2` ohms.