Question

1. Find the cost to run a 1200-watt microwave oven, if you make microwave popcorn in 5 minutes.

(price per kWh is 13.267 cents)

Answer 1

$${\rm cost}={\rm price}\times {\rm energy\; used}$$

$${\rm cost}={13.267\:{\rm (cents/kWh)}\times 1.2\:\rm kW\times \frac{5}{60}\: hr}\\ =1.33\:\rm cents$$