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photocells are powered by the intensity of light. When we put the photocells in light the free electrons of the photocell move fast in other words they get the energy from light due to which their amplitude increases and they pass the electric charge rapidly hence the photocells are generate the power.

Thermocouples are made of two different types of semi conductors when we heat the one end of the junction of thermocouple electric charge is produce this electric charge is a result of the movement of the free electrons as we increases the heat electric charge is also increase because the amplitude of the vibration of the free electrons is increases with the temprature

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Q: How are photocells and thermocouple cells powered?
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