Alarm clock

An alarm clock is a clock that is designed to make an alarm sound at a specific time. The primary use of these clocks are to awaken people from their sleep in order to start their days in the mornings, but they can also be used for other reminders, such as when timing when cooking. To stop the sound, a button or handle on the clock needs to be pressed, or it stops by itself after a few minutes. A classical analog alarm clock has an extra "hand" that is used to specify the time at which to activate the alarm.

Related Topics:
Clock - Sleep - Cooking - Analog

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Traditional mechanical alarm clocks have a bell on top and which rings, but digital alarm clocks can make other noises. Simple battery-powered alarm clocks make a beeping sound whereas novelty alarm clocks can speak, laugh, or sing. Some alarm clocks have radios that start playing at a specified times, and are known as clock radios.

Related Topics:
Bell - Battery - Radio - Clock radio

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In a mechanical bell-style alarm clock, a spring drives a gear that propels a clacker back and forth between two bells or between the sides inside a single bell. In an electric bell-style alarm clock, the bell rings with an electromagnetic circuit and armature swinging back and forth turning the circuit on and off again repeatedly.

Related Topics:
Spring - Electromagnetic - Circuit - Armature

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