Question

Which of the two requires an electric cell for its working : a Quartz clock or a pendulum clock??

Answer 1

A Quartz clock requires an electric cell for its working.

They are battery powered and they use so little electricity, the battery can even last several years before you need to replace it. They are also much more accurate than pendulum clocks. Quartz watches work in a very different way to pendulum clocks and ordinary watches. They still have gears inside them to count the seconds, minutes, and hours and sweep the hands around the clockface. But the gears are regulated by a tiny crystal of quartz instead of a swinging pendulum or a moving balance wheel. Gravity doesn't figure in the workings at all.