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There is no one formula to guide construction of a coil used in a DC application. There are far too many different ones, and each has special considerations. Is the coil being used in an automobile to fire the spark plugs? Or in the solenoid to release the trunk lid of said automobile?
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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
What is the formula to calculate beta DC?
beta dc= ic/ib!!
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
