What is the difference between the EMF and terminal voltage of a cell?

<p>When no current flows in the circuit, the total potential difference provided by a source is known as the Electromagnetic force (EMF). On the other hand, when current flows in the circuit, the actual voltage across the terminals of the cell is called the terminal voltage. The formula that depicts the relation is:</p><p><math > <mi>V</mi> <mo>=</mo> <mi>EMF</mi> <mo>? </mo> &lt;!- minus sign -&gt; <mi>I</mi> <mi>r</mi> </math></p><p>Where r is the internal resistance and I is the current.</p>

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