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An ammeter or other electrical instrument in which a small coil of wire, supported on jeweled bearings between the poles of a permanent magnet, rotates when current is carried to it through spiral springs which also exert a restoring torque on the coil; the position of the coil is indicated by an attached pointer.
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∙ 11y ago
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Operation of PMMC instrument?
aku pon tatau
Why pmmc instrument is cannot be used to measure ac?
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 is pmmc type of instruments?
Produce of series type Ohmmeter using PMMC of Ifsd:100uA for range of 0-20kohm?
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.
Is Series resistance and PMMC used as voltmeter?
yes
Does a post dated check comply with the definition of a check and is such a check a valid negotiable instrument?
no it does not complt with the definition of a cheque and its not a valid negotiable instrument
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.
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A portable pipe instrument
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An African woodwind instrument.
What is the definition of babarak palawan instrument?
That is not English language.
Scientific definition of scale?
Instrument to weigh objects
What is the definition of 'thrumming'?
Playing or plucking a stringed instrument.
