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The regulation of an alternator is given as _________.
1. \(\frac{{{E_0} - V}}{{{E_0}}}\)
2. \(\frac{{V - {E_0}}}{{{E_0}}}\)
3. \(\frac{{{E_0} - V}}{V}\)
4. \(\frac{{V - {E_0}}}{V}\)

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Correct Answer - Option 3 : \(\frac{{{E_0} - V}}{V}\)

Voltage regulation:

Voltage regulation is the ratio of the change in terminal voltage to the rated voltage when the load is suddenly removed with the same excitation, same speed.

Voltage regulation = \(\frac{{{E_0} - V}}{V}\)

% Voltage regulation \( = \frac{{{E_0} - V}}{V} \times 100\)

Where E0 is the no-load voltage

And V is the rated terminal voltage

The range of voltage regulation of an alternator is 30-40%

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