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Some electronic watches are powered by light. A photovoltaic cell on the face of the watch converts light to electricity, which in turn is used to charge a rechargeable battery or capacitor.

The movement of the watch draws its power from the battery or capacitor. As long as the watch is regularly exposed to fairly strong light such as sunlight, it never needs battery replacement.

A seldom used power source is the temperature difference between the wearers arm and the surrounding environment as applied in the Citizen Eco-Drive Thermo. There are two main ways in which watches display the time to their owners: analog and digital.

Traditionally, watches have displayed the time in analog form, with a numbered dial upon which are mounted at least a rotating hour hand and a longer, rotating minute hand. Many watches also incorporate a third hand that shows the current second of the current minute.

Watches powered by quartz have second hands that snap every second to the next marker. Watches powered by a mechanical movement have a sweeping second hand, the name deriving from its uninterrupted smooth sweeping movement across the markers.

All of the hands are normally mechanical, physically rotating on the dial, although a few watches have been produced with “hands” that are simulated by a liquid-crystal display. Analog display of the time is nearly universal in watches sold as jewelry or collectibles, and in these watches, the range of different styles of hands, numbers, and other aspects of the analog dial is very broad.

In watches sold for timekeeping, analog display remains very popular, as many people find it easier to read than digital display; but in timekeeping watches the emphasis is on clarity and accurate reading of the time under all conditions clearly marked digits, easily visible hands, large watch faces, etc.. Since the advent of electronic watches that incorporate puters, digital displays have also been available.

A digital display simply shows the time as a number, e.g., 10:30 AM instead of a short hand pointing towards the number 10 and a long hand pointing towards the number 6 on a dial. Cheaper electronics permitted the popularization of the digital watch in the second half of the 20th century.

They were seen as the great new thing. Douglas Adams, in the introduction of his novel The Hitchhikers Guide to the Galaxy, would say that humans were so amazingly primitive that they still think digital watches are a pretty neat idea.

The first digital watch, a Pulsar prototype in 1970, was developed jointly by Hamilton pany and Electro-Data. A retail version of the Pulsar was put on sale on April 4th 1972.

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