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? 10% 80% 90% 100%

Answer 1

The answer is 10%. just took the test. hope it helps!!

Answer 2

The efficiency of the bulb is 10% as it works to put out light.

What is efficiency?

• Efficiency is the ratio of output work to input work.
• It is expressed as a percentage.
• Efficiency = output work / input work.
• For an electric bulb it is the light it generates / the energy it takes as input.

• Now, in the case of an electric bulb we find their efficiency is very low.
• An electric bulb has low efficiency because it puts out less light energy than the amount of electrical energy that is put into the bulb.
• So here in the option we are given 10% , 80% , 90% and 100 %.
• It is impossible for any machine or device to produce 100% efficiency, so that cannot be the answer.
• Here 80% and 90% are also very large percentage for an electric bulb.

Therefore the correct answer is option (A) 10% . Efficiency of the bulb is 10%.

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