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It provides a source of power to the circuit, in the form of direct current electricity, at a potential difference of 9 volts.

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9y ago
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11y ago

May be using a battery eliminator and setting it up at 9 volts

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Wiki User

10y ago

It's used to provide operating power for small devices that are

designed to operate with a 9-volt small current power supply.

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Q: What does a 9 volt battery do?
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