Homework Help: phyical science

Posted by ashley on Saturday, September 4, 2010 at 10:07am.

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?
2¢

what is kwh

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

phyical science - Damon, Saturday, September 4, 2010 at 10:14am
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 - ashley, Saturday, September 4, 2010 at 8:30pm
so will the cost be 0.01cents

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