Hertz is the unit of measure that describes cycles per second in alternating current.

Hertz is the unit of measure that describes cycles per second in alternating current.

• A. Ampere
• B. Hertz
• C. Ohm
• D. Coulomb

Answer: (B)

Frequency is how often something repeats each second. In alternating current, the waveform repeats as the current continually reverses direction. Hertz is the unit for frequency, defined as one cycle per second, so it directly expresses how many complete cycles the current makes each second. For example, 60 Hz means the current completes 60 full cycles every second. The other units measure different quantities: ampere is electric current (amount of charge passing per second), ohm is resistance (how much a material resists current), and coulomb is electric charge. None describe how often the waveform repeats, so they don’t convey AC frequency.

Frequency is how often something repeats each second. In alternating current, the waveform repeats as the current continually reverses direction. Hertz is the unit for frequency, defined as one cycle per second, so it directly expresses how many complete cycles the current makes each second. For example, 60 Hz means the current completes 60 full cycles every second. The other units measure different quantities: ampere is electric current (amount of charge passing per second), ohm is resistance (how much a material resists current), and coulomb is electric charge. None describe how often the waveform repeats, so they don’t convey AC frequency.