# Electromagnetics (Difference in self induction in AC and DC)

## Main Question or Discussion Point

Hello folks.

I have an electromagnetics quiz tomorrow and I am kind of nervous. I can't seem to grasp the concept of induction, more importantly how it differs in AC and DC circuits.

So in lay terms: Induction is production of electric current across a conductor which is moving through or being passed by a magnetic field.

Tell me if I am way off here:

In DC, when the primary current is turned on, the induced current moves in the opposite direction of the primary current. When the primary current reaches it's peak, no induced current is imparted since the magnetic lines of force are stationary (no electromotive force). When the primary current is switched off, the induced current gradually decreases, moving in the same direction as the primary current.

In AC, a steady flow of electrons is supplied for half the cycle (since the electrons move back and forth) During the other half of the cycle, the north and south poles of the magnetic field induce an against the incoming supply of electrons, which is called inductive reactance.

Someone please tell me if I'm on the right track here. This stuff is driving me nuts

Thanks,

O

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Drakkith
Staff Emeritus