A microwave oven has a power requirement of 1235 W. A frozen dinner requires 6.0 min to heat on full power.

Question

(a) How much electrical energy (in kWh) is used?
1 kWh

(b) If the cost of electricity is 12 cents per kWh, how much does it cost to heat the dinner?
2¢

what is kwh

if the cost of electricity is 12 cent per kwh,hom much does it cost to heat the dinner

Answer 1

6 / 60 = 0.1 hour

1235 watts = 1.235 kw

so

1.235 * 0.1 = .1235 kw hr

.1235 kw hr * .12 dollars/ (kw hr) = $0.01482
or about a penny and a half

Answer 2

so will the cost be 0.01cents