Question

A toaster oven has a power rating of 1200W. If you cook a pizza in it for 1 hour at 450°F, how many

joules of electrical energy are converted into heat by the toaster oven?

Answer 1

Answer;

= 4,320,000 joules

Explanation;

Power is the ratio of Work per unit time. When work is done in a given span of time, the ratio of work performed with respect to time is called Power.

Therefore;

Power = Work done/time

Power = 1200 Watts and t = 1 hour or 3600 seconds

Thus;

Work done = Power × time

= 1200 × 3600

= 4,320,000 joules or 4320 kJ