Question

An electric iron is rated 500W, 200V calculate the :

(a) the current required to operate the iron

(b) the heat generated in 30minutes.

Answer 1

(a)

$$I=\frac{P}{V}=\frac{500\:\rm W}{200\:\rm V}=2.5\:\rm A$$

(b)

$$Q=Pt\\ =\rm 500\: W\times 30\times 60\: s=900\:000\:J$$