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?
8%
95%
42%

Explanation:

Step1: Calculate energy efficiency

$\text{Energy Efficiency} = \frac{\text{Energy Output}}{\text{Energy Input}} = \frac{42}{100} = 0.42$

Step2: Convert to percentage

$\text{Energy Efficiency\\%} = 0.42 \times 100 = 42\%$

Answer:

42%