# phyical science

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A microwave oven has a power requirement of 1235 W. A frozen dinner requires 6.0 min to heat on full power.
(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?
2ยข

what is kwh

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

• phyical science -

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

• phyical science -

so will the cost be 0.01cents

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