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PHYSICS CH4 Electric Charge and Electric Current — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9SciencePHYSICS CH4 Electric Charge and Electric Current4 Marks
Question
Distinguish e.m.f and potential difference.
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Answer

As both e.m.f and potential difference are measured in volt, they may appear the same. But they are not. The e.m.f refers to the voltage developed across the terminals of an electrical source when it does not produce current in the circuit. Potential difference refers to the voltage developed between any two points (even across electrical devices) in an electric circuit when there is current in the circuit.

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