Q. 40

Expert-verifiedFound in: Page 792

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

A refrigerator has a compressor, but the compressor runs only of the time.

a. If electricity costs, what is the monthly (30 day) cost of running the refrigerator?

b. A more energy-efficient refrigerator with an compressor costs more. If you buy the more expensive refrigerator, how many months will it take to recover your additional cost?

a. The monthly cost will be

b. Months are

We have given,

Power =

Running time =

We have to find the cost of running refrigerator.

The time is given as

Since, the compressor runs only of time.

then,

Since the energy is equal is given by,

Then, the monthly cost will be,

cost=

cost =

we have given,

power=

Time =

We have to find the month which is requires to recover the cost.

Since,

Power =

time=

Then,

Energy will be given by,

Then,

The total cost will be for month,

Total cost

Total cost save per month will be,

save=

Then,

For spending the the required months will be,

required months=

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