Definition:
It is the device which is used for measure of current intensity passing through
a conductor. The measuring unit is miliampere. If the measuring unit is ampere
the device is called ammeter.
Construction:
An ammeter is formed by the following objects:
1) A
horseshoe shaped magnet.
2) Soft
iron core.
3) Solinoid.
4) Shunt
circuit.
5) Hair
spring.
6) Pointer
and scale.
Working:
·
When circuit is switched on the movement
of molecule occurs.
·
Then electromagnet produced.
·
Electromagnet move the hair spring the
pointer move the scale and indicate the intensity.
Use:
1) Measuring
the current intensity passing through a conductor.
2) It
is also used as a safety device.
3) The
amount of electricity measured can display easily.
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