What is the unit commonly used to express frequency?

What is the unit commonly used to express frequency?

• A. Volts
• B. Amperes
• C. Ohms
• D. Hertz

Answer: (D)

Frequency is the rate at which a periodic signal repeats each second. In electrical terms, it’s how many complete cycles an AC waveform makes per second. The unit for that is the Hertz (Hz), with 1 Hz meaning one cycle per second. This is why frequency is expressed in Hz—the unit directly counts cycles per second. For example, common mains power runs at about 50 Hz or 60 Hz depending on the country. Volts measure electric potential, amperes measure current, and ohms measure resistance. These relate to different electrical properties, not how often a waveform repeats, which is why Hertz is the correct unit for frequency.

Frequency is the rate at which a periodic signal repeats each second. In electrical terms, it’s how many complete cycles an AC waveform makes per second. The unit for that is the Hertz (Hz), with 1 Hz meaning one cycle per second. This is why frequency is expressed in Hz—the unit directly counts cycles per second. For example, common mains power runs at about 50 Hz or 60 Hz depending on the country.

Volts measure electric potential, amperes measure current, and ohms measure resistance. These relate to different electrical properties, not how often a waveform repeats, which is why Hertz is the correct unit for frequency.