Question

If the average refrigerator uses 500 watts of energy per hour on a daily basis, and your energy cost is $0.11 per kWh, approximately how much does the energy used by the refrigerator cost per month?

a) $1.30
b) $13
c) $40
d) $55

Answer 1

The monthly cost of energy for a refrigerator using 0.5 kW per hour with an energy cost of $0.11 per kWh is approximately $40, corresponding to the answer option c).

Step-by-step explanation:

To calculate the monthly cost of the energy used by the refrigerator, we first need to determine the daily and then the monthly energy consumption in kilowatt-hours (kWh). Since the average refrigerator uses 500 watts (0.5 kW) of energy per hour on a daily basis, the daily energy consumption is:

0.5 kWh/hour × 24 hours/day = 12 kWh/day

Now, to find the monthly energy consumption, we multiply the daily consumption by the number of days in a month (assuming an average month of 30 days):

12 kWh/day × 30 days/month = 360 kWh/month

Given an energy cost of $0.11 per kWh, the cost of the energy used by the refrigerator per month would be:

360 kWh/month × $0.11/kWh = $39.60/month

Round this cost to the nearest whole dollar gives us approximately $40/month. Therefore, the correct option is c) $40.

Answer 2

$40

Step-by-step explanation:

Given:

Usage per hour = 500 Wh

= 0.5 kWh

cost = $0.11/kWh

Usage per day = 24 × usage per hour

= 24 × 0.5

= 12 kWh

Usage per month = 30 × usage per day

= 30 × 12

= 360 kWh

Cost per month = 0.11 × usage per month

= 0.11 × 360

= $39.6

≈ $40