# In the case of an electromechanical generator, the frequency is

In the case of an electromechanical generator, the frequency is

### Right Answer is: Directly proportional to the speed

#### SOLUTION

Electromechanical devices are reluctance motor, Synchronous Motor, Induction Motor, etc.

A dc generator produces a voltage level proportional to the speed while the AC motor produces a voltage level proportional to the frequency. The synchronous speed of an alternator is given as

Ns = 120f/P

Where f = frequency
P = number of poles

Large electric power grids are complex dynamical systems, displaying electromechanical coupling on a nearly continental scale. Electrical frequencies are among the key output variables reflecting electromechanical behavior. At locations with synchronous generation attached, the inherent physics of the synchronous machine dictate that the electrical frequency of the generator voltage and mechanical rotational speed of the generator are locked in fixed proportion to each other, so that variation of frequency directly reflects deviations in rotational speed away from the desired steady state.

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