Question

energy output = 25 units
energy input = 100 units
if you want to calculate energy efficiency,
what value should be substituted into the
green box?
? ÷ □ = energy efficiency
energy output ÷ energy input = energy efficiency
hint: enter a number.

Explanation:

Step1: Recall energy efficiency formula

The formula for energy efficiency is given as \( \text{Energy Efficiency} = \frac{\text{Energy Output}}{\text{Energy Input}} \).

Step2: Identify the value for the green box

From the problem, \( \text{Energy Output} = 25 \) units. So the value to substitute into the green box (the numerator) is 25.

Answer:

25