Question

If a current of `5 A` passing through a circuit generates `45 W` of power, what is the resistance of the circuit?

Answer 1

`1.8 \Omega`

Explanation:

Equations you can work with electrical work are

`P = IV = I^2R=V^2/R`

Given in the problem are:
`I = 5A`
`P = 45 W`

Make use of the equation `P = I^2R` where `R = P/I^2`

Therefore,
`R = (45W)/(5A)^2 = 1.8 \Omega`