Answer :

Final answer:

To control the frequency of an AC signal, adjust the rotational speed of the generator's turbines, tune resonant circuits by varying circuit elements, or directly manipulate frequency and amplitude settings on a function generator.

Explanation:

To control the frequency of the generated AC signal, a few methods are commonly employed, informed by alternating-current (AC) circuit principles. An AC generator's frequency can be adjusted by varying the rotational speed of its turbines, as in hydroelectric dams. Electric signals are often recorded as sine functions, and the frequency signifies how fast the waveform repeats. For finer control, especially in electronic devices like radios and cell phones, a resonant circuit can selectively pass or block frequencies, which is achieved by adjusting the elements in the circuit such as capacitors and inductors to reach a desired resonant frequency. This is how radios tune to a specific station or cell phones filter signals.

Additionally, function generators used in laboratories allow direct control over frequency and amplitude for experimental purposes, changing the sound produced by a speaker, for example. Using these controls, unwanted frequencies, known as 'noise', can be filtered out using RC filters or by tuning the circuit to resonate at the desired frequency. Changes in frequency, while maintaining a constant amplitude, result in proportional changes in the current in the circuit.

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