A microwave oven has a power requirement of 1256 W. A frozendinner requires 5.2

Question

A microwave oven has a power requirement of 1256 W. A frozendinner requires 5.2 min to heat on full power. a. How much electrical energy (in kWh) is used?-----kWh b. If the cost of electricity is 12 cents per kWh, how muchdoes it cost to heat the dinner?-----cent A microwave oven has a power requirement of 1256 W. A frozendinner requires 5.2 min to heat on full power. a. How much electrical energy (in kWh) is used?-----kWh b. If the cost of electricity is 12 cents per kWh, how muchdoes it cost to heat the dinner?-----cent

Explanation / Answer

Power P = 1256 W

Time t= 5.2 min = 5.2 / 60 = 0.0866 h

(a). electrical energy E = Pt

                                    = 108.85 W h

                                    = 0.10885 kw h

(b). cost C = 12 cents / kW h

Required cost = E * C = 1.306 cents

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