The efficiency of the 60 W light bulb that emits 2 W of visible light is 3.3%
How to determine efficiency
Efficiency can be obtained according to the following equation:
Efficiency = (power output / power input) × 100
With the above formula, we can obtain the efficiency of the light bulb as follow:
- Power input = 60 W
- Power output = 2 W
- Efficiency =?
Efficiency = (power output / power input) × 100
Efficiency = (2 / 60) × 100
Efficiency = 3.3%
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