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a pmmc has a coil suspended in permanent magnetic field.acording to the laws of electromagnetism a current carrying coil susspended in a magnetic field experiences an electromagnetic torque.This torque is counterbalanced by the mechanical torque devoloped in the coil in equlibrium.The angle teta can be measured and it is calibrated to directly give the current
What else can I help you with?
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.
What is an explanation of mechanism of fluidization?
mechanism of fluidized bed
What is pmmc type of instruments?
Produce of series type Ohmmeter using PMMC of Ifsd:100uA for range of 0-20kohm?
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.
Operation of PMMC instrument?
aku pon tatau
Is Series resistance and PMMC used as voltmeter?
yes
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 do we connect a transistor to a DC motor?
Transistors are not normally connected to dc motors, but it is possible to use transistors in a speed-control mechanism for a motor.
Mechanism of Jones oxidation?
There is an excellent explanation to be found at http://www.organic-chemistry.org/namedreactions/jones-oxidation.shtm
A explanation of ACDC.?
ac dc come from the back of the vacum cleaner Angus parents had in their house. It was written on it.
Why pmmc instrument have uniform scale?
PMMC instruments have a uniform scale because the deflection of the coil is directly proportional to the current passing through it. This linear relationship allows for precise measurement of small changes in current, making the scale consistent and uniform.
What is a propose explanation for a particula set of phenomena?
One possible explanation is that the phenomena could be the result of a specific cause or underlying mechanism, supported by evidence or logical reasoning. Additional research or experimentation may be needed to further validate the proposed explanation.
