Automatic wrist watches get energy

Automatic wrist watches get energy from the various movements of our hand, as indicated by option [D]. Inside the watch, there’s a component called a rotor, which rotates with the motion of the wearer’s wrist. As the rotor moves, it winds the mainspring, which stores potential energy. This energy is then gradually released to power the watch’s movement and functions. The winding of the mainspring is what eliminates the need for a battery in automatic watches. This ingenious mechanism harnesses the kinetic energy produced by the wearer’s everyday activities, such as walking or moving the wrist, and converts it into the mechanical energy needed to keep the watch running. This process demonstrates the principle of energy conversion, where one form of energy (kinetic energy from movement) is transformed into another form (potential energy stored in the mainspring), allowing the watch to function autonomously without external power sources. Therefore, the energy source for automatic wrist watches lies in the natural movements of the wearer’s hand, making them self-sustaining and environmentally friendly timepieces.