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A good solar cell has an efficiency of about 15%. If a solar panel receives 100 watt of power from solar radiation, what is its electrical power output?
A85 watt
B100 watt
C15 watt
D1.5 watt
Answer & Solution
Correct answer: C. 15 watt
1. Efficiency 15% means output is 15% of the input power.
2. Output = 15% of 100 W = 0.15 × 100 = 15 W.
3. 85 W (option A) is the wasted part, not the output, a trap.
4. 100 W (option B) ignores losses, so it is wrong.
5. 1.5 W (option D) misplaces the decimal, so it is wrong.
6. So the electrical output is 15 watt.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 5 "Towards Green Energy", p.66_
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