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What is an alarm clock?
May 31, 2018
Alarm Clock.jpg

An alarm clock is a clock with a noisy time device. It can not only indicate time, but also send out sound signals or other signals according to people's preset time. The main structure of the alarm clock is mainly mechanical and quartz electronic two categories. Other types, such as transistor swing and tuning fork, are rarely used and are usually placed on the table, mainly for travel alarm clocks. The daily error of the daily mechanical alarm clock is usually within 120 seconds / day, and the departure time error of the quartz electronic alarm clock is usually within 0.2 seconds / day.

There are many kinds of alarm clock, and mechanical and quartz have become the indispensable items in people's life since it was invented by the principle of pendulum.

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