Question

efficiency is the ratio of output work to input work, expressed as a percentage. light bulbs put out less light energy than the amount of electrical energy that is put into the bulb. the goal of the bulb is to produce light. what is the efficiency of this bulb as it works to put out light? light 10 j electrical energy 100 j heat 90 j 10% 80% 90% 100%

Explanation:

Step1: Recall efficiency formula

Efficiency = $\frac{\text{Output work}}{\text{Input work}}\times100\%$

Step2: Identify values

Output work (light energy) = 10 J, Input work (electrical energy) = 100 J

Step3: Calculate efficiency

Efficiency = $\frac{10}{100}\times100\% = 10\%$

Answer:

A. 10%