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Pmmc meter are most accurate instrument for DC measurement however they are unable to measure the AC quantity. The working principle is as follows: a moving coil is free to move in a external static magnetic field. And the pointer moves according to the interaction of two fields, field of static mag. and that of measuring quantity. Now in case of it is impossible to produce a sustained magnetic field, that's why we can not use PMMC to measure the ac.
What else can I help you with?
Which weather instrument is use to measure air pressure?
The barometer is the instrument that is used to measure the air pressure.
What is the the instrument used too measure mass?
This instrument is an adequate type of balance.
Instrument used to measure roughness of road?
One instrument used to measure roughness of roads is the response type road roughness meters (RTRRMs)
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A durometer is an instrument that is used to measure hardness. Specifically, a durometer can be used to measure a material's resistance to indentation.
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A hygrometer is used to measure water vapor in the atmosphere. This instrument can measure humidity levels in the air to determine the amount of water vapor present.
Why pmmc instrument measure only ac not dc?
Permanent magnet moving coil instruments are used for measuring d.c. quantities only. This is so because for these instruments the torque is proportional to the operating quantity either voltage or current.
Why pmmc used for DC only?
Because in the coil DC current follow easly and pmmc meter is making with coil and AC current is not follow in coil so we used the pmmc only fpr DC current.
The instrument used to measure wind speed is a?
No. The instrument used to measure wind speed is an anemometer.
What instrument is used to measure snowfall?
The instrument which is used to measure snowfall is called a snow gauge.
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A thermometer
Is Series resistance and PMMC used as voltmeter?
yes
Instrument used to measure the speed of rotation or correct shape of the thing?
There is no single instrument for either of these things
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The instrument used to measure humidity is called a hygrometer.
What instrument do you use to measure humidity?
The instrument used to measure humidity is called a hygrometer.
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A protractor is used to measure an angle.
What instrument is used to measure on angle?
A protractor can be used to measure an angle.
An instrument used to measure mass is call?
This instrument is a balance.
