CH 4 Question 2

Question

Question 2:  On a particular day the following appliances are used for the time indicated: 1600W coffee maker, 10 min, and 1100W microwave oven, 4 min. With these power requirements, find how much it costs to use these appliances at an electrical cost of 8 cents per kWh.

Answer 1

1600 W = 1.6 kW

10 min = 1/6 hr

So a 1600 W coffee maker running for 10 minutes uses (1.6)(1/6) = 0.26667 kW-hrs

If the cost is 8 cents per kWh, that's $0.08 so the cost to run the coffee maker for 10 minutes is (0.26667)(0.08) = $0.0213

Repeat for the microwave and add them together.