Measurement of Time
We know that the measurement of time is read by a clock or a watch.
Any clock or watch except a digital watch, has a dial. On the circular border of the dial of a watch or clock there are the hour numbers from 1 to 12 at equal intervals. Between the two numbers there are five divisions. Each division represents a minute.
There are two hands of different lengths having one of the ends fixed at the center of the dial. The small hand is the hour hand and longer hand is the minute hand. The hourhand moves slower than the minute hand. There is also a third hand called the secondhand. It moves very fast.
The hour hand makes one round of the dial in 12 hours. It moves
from one number to its nearest number in one hour, i.e., the hour hand
goes from 12 to 1 or 1 to 2 or 2 to 3, ........ etc., in one hour.
The minute hand makes one round of the dial in 1 hour. It moves
across one division in one minute or five divisions in 5 minutes.
If there is a secondhand, it makes one round of the dial in one minute, i.e. it moves across one division in one second.
On this basis we say:
1 hour = 60 minutes or 60 minutes = 1 hour
1 minute = 60 seconds or 60 seconds = 1 minute
1 hour = 60 minutes = 60 x 60 or 3600 seconds
We know that the face of the clock is marked with the
numbers from 1 to 12, which divide the clock face into 12 equal parts. These 12
parts are further divided into 60 small divisions. So, there are 5 small
divisions between any two numbers on the clock face. The minute hand takes 5
minutes to move from one number to the next number. We have learnt how to read
the time correct to 5 minutes.
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Related Concepts
● Units
for Measuring Length
● Measuring
Instruments
● To
Measure the Length of a Linesegment
● Perimeter
of a Figure
● Unit of
Mass or Weight
● Examples
on Unit of Mass or Weight
● Units
for The Measurement of Capacity
● Examples
on Measurement of Capacity
● Measurement
of Time
● Read a
Watch or a Clock
● Antemeridian
(a.m.) or Postmeridian (p.m.)
● What Time it is?
● Time
in Hours and Minutes
● 24 Hour Clock
● Units of Time
● Examples
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● Time Duration
● Calendar
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Guides us to Know
4th Grade Math Activities
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