Question

What is the PERCENT efficiency if a computer is supplied with 500 J of energy and is able to convert 400 J to useful energy?
A. 0.8 %
B. 8 %
C. 80 %
D. 800 %

Answer 1

Considering the definition of efficiency, the percent efficiency of the computer is 80%.

What is efficiency

Energy efficiency is defined as the efficient use of energy. A device, process or installation is energy efficient when it consumes less than the average amount of energy to carry out an activity.

The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. The efficiency can be calculated as a decimal or a percentage.

The efficiency of a device can be calculated as:

Expressed as a decimal: $efficiency =\frac{useful energy out}{total energy in}$

Expressed as a percentage: $efficiency =\frac{useful energy out}{total energy in}x100$

Percent efficiency of the computer

In this case, you know:

• useful energy out= 400 J
• total energy in= 500 J

Replacing in the definition of efficiency:

$efficiency =\frac{400 J}{500 J}x100$

Solving:

$efficiency =0.8x100$

efficiency= 80%

Finally, the percent efficiency of the computer is 80%.

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