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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.
Can a 12vac coil be operated by 24vdc?
no, in an ac circuit the coil provides impedance but the DC coil needs some resistance to limit the current
Will a solenoid burn up?
If the core (moving part) of an AC solenoid does not move into position when energized, the current flow stays high (inrush) and overheats the coil. Normally the magnetic properties change and the current drops to a lower holding value so the coil does not overheat. DC solenoids do not have this problem.
How does a speaker work in a circuit?
They will either pull in or push out depending on the polarity of the DC voltage and remain stationary. This is a bad idea as the DC resistance of the voice coil is much less than the AC impedance of the voice coil and it is possible to overheat and burn out the voice coil due to the much higher current the DC voltage can produce in the voice coil compared to the AC voltage that would drive the voice coil in normal operation.
What part of a DC motor on the armature is responsible for connecting brushes to a coil?
commutator
What are the protective devices incorporated in DC starters?
The No volt coil (NVC) and the Overloadrelease(OLR) are the two protecting devices incorporated in DC starters
What types of dc motor starters?
3 point & 4 point starters are used
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 will happen if you pass dc current through a single coil?
If dc current is passed through a single coil, it is going to remain constant.
What is the difference between 10 amp and 15 amp?
what is the diference between 12V 15A DC coil & 12V 10 amps DC coil
What are the best areas to live in in Washington dc?
Georgetown and Cleveland Park, for starters.
In what two ways can the rotation of a shunt connected dc motor be reversed?
DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil.
What is moving coil voltmeter?
mic or moving iron coil is instrument type works on ac and dc
Can a 12vac coil be operated by 24vdc?
no, in an ac circuit the coil provides impedance but the DC coil needs some resistance to limit the current
What is moving coil type voltmeters?
mic or moving iron coil is instrument type works on ac and dc
Will a solenoid burn up?
If the core (moving part) of an AC solenoid does not move into position when energized, the current flow stays high (inrush) and overheats the coil. Normally the magnetic properties change and the current drops to a lower holding value so the coil does not overheat. DC solenoids do not have this problem.
What will happen if you take a dc coil off its armature?
It will no longer be attached!
