Back EMF
the counter-electromotive force (abbreviated counter emf, or cemf ) 1 is the voltage, or electromotive force, that pushes against the current which induces it, is caused by a changing electromagnetic field. it’s represented by lenz’s law of electromagnetism. back electromotive force is a voltage that occurs in electric motors where there is relative motion between the armature of the motor and the external magnetic field. counter emf is a voltage developed in an inductor network by a pulsating current or an alternating current. 2 the voltage’s polarity is at every moment the reverse of the input voltage 3 4
in a generator using a rotating armature and, in the presence of a magnetic flux, the conductors cut the magnetic field lines as they rotate. the changing field strength produces a voltage in the coil; the motor is acting like a generator.. (faraday’s law of induction.) this voltage opposes the original applied voltage; therefore, it is called “counter-electromotive force”. (by lenz’s law.) with a lower overall voltage across the armature, the current flowing into the motor coils is reduced. 5
pretty self explanatory dont you think, i added this as the previous entry was rubbish and he’s obviously visited an engineer who doesn’t know what back emf is.
a phrase a technician uses when he hasn’t a clue what’s wrong and he doesn’t want to be seen not to know what’s wrong, so he talks sh-t!
i think the reasion that it is switching is
a back emf from when you power up the panel?
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