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in Measurement by (54.5k points)

Write a short note on different types of clocks.

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Types of clocks based on display:

1. Analog clocks

2. Digital clocks

1. Analog clocks: It looks like a classic clock. It has three hands to show the time. 

  • Hours Hand : It is short and thick. It shows ‘hour’. 
  • Minutes Hand : It is long and thin. It shows ‘minute’. 
  • Seconds Hand : It is long and very thin. It shows ‘second’. It makes one rotation in one minute and 60 rotations in one hour. Analog clocks can be driven either mechanically or electronically.
2. Digital clocks:
  • A digital clock displays the time directly. It shows the time in numerals or other symbols. It may have a 12 hours or 24 hours display. 
  • Recent clocks are showing Date, Day, Month, Year, Temperature etc. 
  • Digital clocks are often called as Electronic Clocks.

1. Quartz Clock:

  • These clocks are activated by ‘electronic oscillations’ , which are controlled by a ‘quartz crystal’. 
  • The frequency of a vibrating crystal is very precise. So, the quartz clock is more accurate than the mechanical clock.
  • These clocks have an accuracy of one second in every 109 seconds.

2. Atomic Clock: 

  • These clocks are making use of periodic vibrations occurring within the atom. 
  • These clocks have an accuracy of one second in every 10b seconds. 
  • Atomic clocks are used in Global Positioning System (GPS), Global Navigation Satellite System (GLONASS) and International time distribution services
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