Question

If you plug a toaster into an outlet that provides an electrical potential difference of 120 V and this toaster does 64.8 J of work in 1 minute toasting your bread, how much current is flowing through the toaster?

Answer 1

The power dissipated by the toaster, by definition, is:

$P=64.8 J/60s=1.07 J/s=1.07 W.$

The current flowing through the toaster then is:

$I=P/U=1.07W/120 V=0.0089 A=8.9mA.$

Answer: I=8.9mA.