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

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

so is it 1.25*(2/3)=.83

then .83+1.1=1.93
1.93/8=.2416

To calculate the cost of using the appliances, follow these steps:

Step 1: Convert the power requirements from watts to kilowatts.

coffee maker = 1650 watts = 1650 / 1000 = 1.65 kilowatts
microwave oven = 1250 watts = 1250 / 1000 = 1.25 kilowatts

Step 2: Calculate the total energy consumed by each appliance. Energy (kWh) = Power (kW) x Time (hours)

For the coffee maker:
Energy (kWh) = 1.65 kW x (40 min / 60 min) = 1.65 kW x 0.67 hours = 1.10 kWh

For the microwave oven:
Energy (kWh) = 1.25 kW x (23 min / 60 min) = 1.25 kW x 0.38 hours = 0.47 kWh

Step 3: Calculate the total cost for both appliances. Cost = Energy (kWh) * Electrical cost per kWh

Total cost = (1.10 kWh + 0.47 kWh) * $0.08/kWh = 1.57 kWh * $0.08/kWh = $0.1256

Therefore, the cost to use the appliances on this particular day at an electrical cost of 8¢ per kWh is approximately $0.13.

To calculate the cost of using the appliances, we need to follow these steps:

1. Determine the total energy consumption of each appliance.
- Energy consumption = Power (in watts) × Time (in hours)

For the coffee maker:
Energy consumption = 1650 W × 40 min (convert to hours by dividing by 60) = 1100 Wh = 1.1 kWh

For the microwave:
Energy consumption = 1250 W × 23 min (convert to hours by dividing by 60) = 479.17 Wh = 0.47917 kWh

2. Calculate the total energy consumption by adding up the energy consumed by each appliance.

Total energy consumption = Energy consumption of coffee maker + Energy consumption of microwave

Total energy consumption = 1.1 kWh + 0.47917 kWh = 1.57917 kWh

3. Calculate the cost of using the appliances by multiplying the total energy consumption by the cost per kilowatt-hour.

Cost of using appliances = Total energy consumption × Cost per kWh

Cost of using appliances = 1.57917 kWh × $0.08/kWh = $0.1263336

Therefore, it costs approximately $0.1263 (or about 13 cents) to use the appliances at an electrical cost of 8¢ per kWh.