Question

You are shopping for a new refrigerator and one choice is a model that sells for $1,000 and

uses 200 W of power when the compressor is on. You decide instead on a newer, more

efficient model of the same size that costs $1,250 and uses 150 W. You can assume that for

both models the compressor will be on 50% of the time; the rest of the time no power is

used.

a. How much energy does the refrigerator use in a day, in kWh? What is the total amount

of energy saved in a year by choosing the more efficient appliance?

Answer 1

The cheaper model consumes 200W whereas the costlier model consumes 150 W.

The consumer will be on for 50% of the time i.e., during a single day, the refrigerator will be on for 12 hrs.

Hence, energy consumed in a single day by

Energy consumed in a year by the

Hence, energy saved is