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A computer's power supply unit provides all needed voltages for the components of a computer that are internal.
Externals either draw power from the USB bus (which in turn gets it's power from the aforementioned PSU or a Hub with a power supply) OR have their own internal power supply with a cable.
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What provides power to the internal components of the computer?
In the case of a desktop computer a power supply that in turn plugs into a household outlet provides power to the internal components of the computer. In the case of a laptop or tablet a battery provides power.
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What provides power to the internal components of the computer?
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