How does a solar cell power a calculator?

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Multiple Choice

How does a solar cell power a calculator?

Explanation:
Solar cells power calculators by turning light energy into electrical energy. When light shines on the solar cell, photons give energy to electrons in the semiconductor, creating electron-hole pairs. The built‑in electric field at the junction separates these charges, generating a current that supplies the calculator’s circuits. This direct conversion from light to electricity is what makes the device run as long as there is light. The other ideas would require different mechanisms (heating to get electricity, or using stored chemical energy, or simply emitting light), which isn’t how a solar cell works.

Solar cells power calculators by turning light energy into electrical energy. When light shines on the solar cell, photons give energy to electrons in the semiconductor, creating electron-hole pairs. The built‑in electric field at the junction separates these charges, generating a current that supplies the calculator’s circuits. This direct conversion from light to electricity is what makes the device run as long as there is light. The other ideas would require different mechanisms (heating to get electricity, or using stored chemical energy, or simply emitting light), which isn’t how a solar cell works.

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