# phyical science

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On a particular day, the following appliances are used for the times indicated: coffee maker, 40 min, and microwave oven, 23 min. Using the power requirements given in the table below, find how much it costs to use the appliances at an electrical cost of 8¢ per kWh.

coffee maker=1650w

microwave=1250 w

• phyical science -

Compute and add the kWh of each appliance. For the coffee maker, it is 1.65 kW * (2/3)h = 1.1 kWh.

Add the microwave kWh and multiply the sum by 8¢ per kWh

• phyical science -

so is it 1.25*(2/3)=.83
then .83+1.1=1.93
1.93/8=.2416

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