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physical power source

Physical power sources are devices that convert solar energy or light energy, thermal energy and nuclear energy directly into electrical energy. They mainly include solar cells, thermoelectric generators, thermionic generators and nuclear batteries. However, they do not include large devices such as magnetic fluids and atomic reactors. Their characteristics are that the output power of a single battery is generally not large, and it is direct current, with a long storage life and can be used continuously for a long time.
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