The correct answer is D. electrical resonance frequency meter.
A Weston frequency meter is a type of frequency meter that uses a Weston cell to measure the frequency of an alternating current. A reed vibrator frequency meter is a type of frequency meter that uses a reed switch to measure the frequency of an alternating current. A heterodoxy frequency meter is a type of frequency meter that uses a heterodyne circuit to measure the frequency of an alternating current. An electrical resonance frequency meter is a type of frequency meter that uses the principle of electrical resonance to measure the frequency of an alternating current.
Electrical resonance occurs when the frequency of an alternating current is equal to the natural frequency of an electrical circuit. When this happens, the current in the circuit is amplified. This principle can be used to measure the frequency of an alternating current by using a circuit that has a known natural frequency. The current in the circuit is then measured and the frequency of the alternating current is determined from the natural frequency of the circuit.
Electrical resonance frequency meters are the most accurate type of frequency
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