Early clocks were powered by falling weights and springs. Later clocks with pendulums came into existence in 1657. Electric clocks came into being after 1850, but were not popular until the twentieth century. An electric motor with alternating current powers these clocks. Quartz clocks use the vibrations of a quartz crystal to power the clock.
Watches are different than clocks in that they are carried about or worn.
The first watches appeared by the 1500s and were made by hand. They were very fancy and their faces were covered by fine metal strips to protect the markings. Watches were manufactured by machine in the mid 1800s. At first watches had knobs on the outside that the wearer wound to keep the mainspring powered inside. Later on, self-winding watches derived power from the movement of the wearer.