Question

How much does it cost to power a refrigerator for 30 days if it is rated at 200 Watts and the power company charges $0.07 per kWh?

Answer 1

To power a refrigerator for 30 days, the total energy consumption needs to be calculated using the power rating and the cost per kilowatt-hour. The cost can then be determined by multiplying the total energy consumption by the cost per kilowatt-hour.

Step-by-step explanation:

To calculate the cost of powering a refrigerator for 30 days, we need to know the power rating of the refrigerator and the cost per kilowatt-hour (kWh) charged by the power company. In this case, the refrigerator is rated at 200 Watts and the power company charges $0.07 per kWh.

We first need to calculate the total energy consumption of the refrigerator for 30 days:

1. Convert the power rating from Watts to kilowatts: 200 Watts ÷ 1000 = 0.2 kilowatts
2. Calculate the total energy consumption: 0.2 kilowatts × 30 days = 6 kilowatt-hours (kWh)

Finally, we can calculate the cost of powering the refrigerator for 30 days:

1. Multiply the total energy consumption by the cost per kWh: 6 kWh × $0.07/kWh = $0.42

Therefore, it would cost $0.42 to power the refrigerator for 30 days.

Answer 2

$10.08

Step-by-step explanation:

There are 24 hours in a day.

Now, if we assume that the refrigerator uses the 200 Watts per hour, thus, in one day, it will consume;

200 x 24 = 4800 watts

Thus, in 30 days, it will consume;

4800 x 30 = 144,000 Watts

Now, 1000 watts = 1KW

Thus,144,000 watts = 144,000/1000 = 144 KW

Now, since the power company charges $0.07 per kWh, thus the cost for 144 KW = 144 x 0.07 = $10.08