The e.m.f. of a cell is _____ the voltage across its terminals when no current flows. Fill in the blank.

more than

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less than

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equal to

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none of these

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Solution

The correct option is D equal to
Voltage across the cell terminals $V = E - I r$
$∴$ $I = 0$ $⟹ V = E$
Thus e.m.f of a cell is equal to the voltage across its terminal when no current flows.

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Similar questions

A cell is used to send current to an external circuit.

(a) How does the voltage across its terminals compare with its e.m.f.?

(b) Under what condition is the e.m.f. of the cell equal to its terminal voltage?

1.5 Ω

2 o h m

0.5 a m p

5 o h m

0.25 a m p

2 A

12 V

3 A

15 V

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