Question

A charge of `36 C` passes through a circuit every `4 s`. If the circuit can generate `45 W` of power, what is the circuit's resistance?

Answer 1

`R=2.25 Ohm`

Explanation:

Here:

`Q=36C`
`t=4s`
`P=45W`
`R=?`

First, we will take out the current's value:

`I=Q/t`

`I=36/4`

`I=4A`

We know,

`R=P/I^2`

`R=36/4^2`

`R=36/16`

`R=2.25 Ohm`