Which energy is stored in the spring while winding a clock? In which energy it gets converted when the clock is working?

Hint: A wound-up watch spring possesses potential energy saved in it because it is turned up. The spring loses itself; the potential energy transforms into kinetic energy with which it drives the hands of the watch.

Complete step-by-step solution:
The potential energy is due to its position, arrangement of the position of the object. This energy is collected in an object. There are two kinds of potential energy, specifically gravitational and elastic potential energy. Kinetic energy is due to its movement if defined as work required to hasten a body from its steady-state to its regular velocity.
The energy obtained due to the body's position or energy due to the shift of position of the particles inside the body is called the body's potential energy. There are several kinds of potential energy. For example, at the top of its swing, the pendulum of a clock has gravitational potential energy, which is transformed to kinetic energy as it drops.
In a watch, a wheel is attached along with an elastic spring. While twisting this spring, its size gets shortened or contracted. We do work to alter the size of the spring, which persists stored as potential energy in the spring. There is the link of the needle of the watch with the sport, so the spring rewinds and rotates in the opposite direction. As a consequence, the needle of the watch turns. The potential energy of the spring converts into kinetic energy.

Note:To know the type of energy saved in the spring watch, we must learn the mechanism of the spring watch. The spring watch includes a mainspring which collects elastic potential energy on turning the timepiece. This energy is used to move the watch's hands.