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

Triplicate post; already answered

To find the cost of using the appliances, you need to calculate the total energy consumed by each appliance and then multiply it by the cost per kilowatt-hour (kWh).

1. Begin by converting the power consumed by each appliance from watts to kilowatts:
- Coffee maker: 1650 watts ÷ 1000 = 1.65 kilowatts
- Microwave: 1250 watts ÷ 1000 = 1.25 kilowatts

2. Next, calculate the energy consumed by each appliance by multiplying the power (in kilowatts) by the time (in hours):
- Energy consumed by coffee maker: 1.65 kilowatts × (40 minutes ÷ 60 minutes) = 1.1 kilowatt-hours
- Energy consumed by microwave: 1.25 kilowatts × (23 minutes ÷ 60 minutes) = 0.479 kilowatt-hours

3. Now, add up the energy consumed by both appliances to get the total energy consumption:
- Total energy consumed = 1.1 kilowatt-hours + 0.479 kilowatt-hours = 1.579 kilowatt-hours

4. Finally, multiply the total energy consumed by the cost per kilowatt-hour to find the total cost:
- Total cost = 1.579 kilowatt-hours × $0.08/kWh = $0.12632

Therefore, it would cost approximately $0.12632 (or about 12.6 cents) to use the coffee maker for 40 minutes and the microwave oven for 23 minutes at an electrical cost of 8 cents per kilowatt-hour.