What energy changes take place inside a clock?

Answer 1

It depends on the type of clock. A mechanical clock converts potential energy to kinetic energy. The energy is wound up in the spring and is released through the escape mechanism and gears.

In a motorized clock, electricity is converted to magnetism and then motion.

In a digital clock, electricity is converted to light and the electricity is also used to power the logic circuitry needed to put the correct time on the display.