What is the frequency of an air-conditioning unit that completes 60 alternating cycles per second?

• A. 30 hertz
• B. 60 hertz
• C. 120 hertz
• D. 240 hertz

Answer: (B)

The frequency of an alternating current (AC) is defined as the number of cycles that occur in one second, measured in hertz (Hz). Since the air-conditioning unit is completing 60 cycles every second, the frequency is directly identified as 60 hertz. This means that in one second, the AC completes 60 full cycles of current flow, alternating direction.

In home and commercial electrical systems, 60 hertz is a standard frequency used in North America for AC power supply, making this information essential for ensuring compatibility and proper operation of appliances such as air conditioners. Frequencies noted in the other choices (30 Hz, 120 Hz, and 240 Hz) do not apply to the scenario presented, as they represent different rates of cycles per second which are not consistent with the unit's operation.