explain why the potential difference across the terminals of a cell is more in an open circuit and reduced in a closed circuit
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Because the battery used in the circuit is a source of potential difference and it only works when the circuit is closed.
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Explanation:
In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. Electrical circuits may be connected to ground for several reasons.
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