Question

What is potential drop?

Solution

When the circuit is closed (i.e. when current flowing through the external circuit), potential difference between the terminals of a cell is less than the EMF of a cell by an amountcalled the potential drop or lost volt of the cell. This potential drop (I.r) is due to the internal resistance (r) of the cell and this portion of the voltage of the cell is unavailable in the external circuit.

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