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?
25 ÷ ? = energy efficiency
energy output ÷ energy input = energy efficiency
hint: enter a number.

Explanation:

Step1: Recall the formula

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

Step2: Identify the values

Given that Energy Output is 25 units and Energy Input is 100 units. In the equation \( 25 \div [?] = \text{Energy Efficiency} \), the denominator should be the Energy Input.

Step3: Substitute the value

So the value to substitute into the green box (the denominator) is the Energy Input, which is 100.

Answer:

100