An alarm clock is a clock designed to alert a person or group of people at a specified time, most often to wake them from sleep, and most alarm clocks signal through sound, though some instead use light or vibration, with some models using sensors to avoid waking a sleeper who is in a deep stage of sleep. Many alarm clocks include radio receivers that can be set to start playing at a chosen time, known as clock radios, and modern televisions, computers, mobile phones and digital watches now commonly include their own alarm functions as well. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
SignificanceThe alarm clock let individuals set a precise waking time in advance rather than rely on someone else, making it possible to coordinate a household or a workforce around a shared schedule. 1 Connections
In Field
Source Alarm clock (Wikipedia)
Sources
1. Alarm clock (Wikipedia)
Wikimedia FoundationHistory section, first American alarm clock sentence
The first American alarm clock was created in 1787 by Levi Hutchins in Concord, New Hampshire.
Lead paragraph, first sentence
An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time.
In Field: Mechanical Engineering, Lead section
An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time.
View the Source Reader Challenges (0)
No disputes yet. Spotted an error or a better source? Open the first one.
Sign in to dispute this or suggest a correction.