# The regulation of an alternator is given as _________.

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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%