Question

You are a scientist working on increasing the efficiency of appliances to waste less electricity. You are running experiments measuring the input, output, and waste energy from a new type of light source. Given the data below, determine the percentage of energy transformed into light.

25978.8 joules in, 14153.3 joules wasted, 11825.5 joules out
A. 45.5%
B. 54.5%
C. 11825.5%
D. 83.5%

Answer 1

Answer : Option A) 45.5 %

Explanation : If you know the input energy and the output energy then it's easy to calculate the energy efficiency of the given source.

Here by using the formula of % energy efficiency η =
`( Energy_(out) )/(Energy_(in)) X 100`

when we substitute the given values, we get η = (11825.5 / 25978.8) X 100
= 45.5 %