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2. Electric clock - Wikipedia

   en.wikipedia.org/wiki/Electric_clock

   Master clock from synchronized school clock system. c.1928 Electromechanical movement winds each minute and impulses slave clocks each minute. Operates on 24 Volts DC. A clock that employs electricity in some form to power a conventional clock mechanism is an electromechanical clock.

3. Clockwork - Wikipedia

   en.wikipedia.org/wiki/Clockwork

   Keys of various sizes for winding up mainsprings on clocks Mechanism of a Wall Clock, Ansonia Co. 1904. The stored amounts of energy used by a given piece during its operation is often housed within it; this frequently happens via a winding device that applies mechanical stress to an energy-storage mechanism such as a mainspring, thus involving some form of escapement.

4. Clock - Wikipedia

   en.wikipedia.org/wiki/Clock

   In electric clocks, the power source is either a battery or the AC power line. In clocks that use AC power, a small backup battery is often included to keep the clock running if it is unplugged temporarily from the wall or during a power outage. Battery-powered analog wall clocks are available that operate over 15 years between battery changes.

5. Telechron - Wikipedia

   en.wikipedia.org/wiki/Telechron

   Telechron—now the "Clock and Timer Division" of GE—declined in the 1950s, mainly because batteries had become much more long-lived and reliable. Battery-powered clocks have the obvious advantage of not depending on the proximity of a power outlet, and do not require the often somewhat unattractive electric cable.

6. Mainspring - Wikipedia

   en.wikipedia.org/wiki/Mainspring

   The force of the mainspring then turns the clock's wheels as it unwinds, until the next winding is needed. The adjectives wind-up and spring-powered refer to mechanisms powered by mainsprings, which also include kitchen timers, metronomes, music boxes, wind-up toys and clockwork radios.

7. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   It is also possible for quartz clocks and watches to have their quartz crystal oscillate at a higher frequency than 32 768 (= 2 15) Hz (high frequency quartz movements [4]) and/or generate digital pulses more than once per second, to drive a stepping motor powered second hand at a higher power of 2 than once every second, [5] but the electric ...