Question

energy output ÷ energy input = energy efficiency
energy efficiency × 100 = energy efficiency%
energy output = 42 units
energy input = 100 units
what is the energy efficiency percentage?
42%
95%
8%

Explanation:

Step1: Calculate energy efficiency

Energy efficiency = Energy Output ÷ Energy Input
Energy efficiency = \( \frac{42}{100}=0.42 \)

Step2: Calculate energy efficiency percentage

Energy efficiency percentage = Energy efficiency × 100
Energy efficiency percentage = \( 0.42\times100 = 42\% \)

Answer:

42%