Question

A 60-cm-long heating wire is connected to a 120 v outlet. the wire dissipates 45 w. what is the current in the wire

Answer 1

The power dissipated in the wire is
$P=I^2 R=IV$
where I is the current and V the voltage.
Using P=45 W and V=120 V, we find the value of the current in the wire:
$I= \frac{P}{V}= \frac{45 W}{120 V}=0.38 A$