Q. How do electric clocks keep track of time?

Answer

The clock hands are turned at the precise rate thanks to a reduction gear set connected to the electric motor. A synchronous electric motor's rotational speed is precisely matched to the frequency of the alternating current (usually 60 hertz) in the electrical power supply (cycles per second) They have a tiny backup battery that a user may check out. A backup battery on a modern computer motherboard keeps the real-time clock circuit and configuration memory alive even when the machine is powered down. The accuracy of a synchronous electric clock is entirely dependent on the reliability of the AC current that powers it. When this frequency shifts, the accuracy of the electric clock is compromised.