When comparison shopping for a refrigerator, you compare three almost identical options, just varying by power and price:
Cost
Power Rating
Mr. Bean Fridge
$750
800W
SuperCool Fridge
$650
780W
Ice Cold Fridge
$700
675W
On average, the cost of electricity is 18.4¢ per kWh (hint: energy can be expressed in kWh instead of J).
Which is the more cost-effective option if you plan on keeping this fridge for at least 10 years?