What happens when AC flows through inductor?
“AC” (alternating current) refers to a current whose level and direction change cyclically over time. When current is about to flow to the inductor, the magnetic field generated by that current cuts across the other windings, giving rise to an induced voltage and thus preventing any changes in the current level.
What is the opposition to current flow in an AC circuit caused by an inductor called?
This opposition is called inductive reactance, symbolized by XL, and is measured in ohms. This characteristic of the inductor may also create a phase shift between voltage and current of the circuit. The phase shift created by inductive reactance always causes voltage to lead current.
What should the current flow through an inductor be?
Remember: inductor current in a pure AC circuit should always be at 90deg phase relative to inductor voltage. For pure AC situations, inductor current and voltage are never zero at the same time. But when you turned on your signal generator, V & I were both zero.
Which is an effective resistance of an inductor?
Current lags behind voltage, since inductors oppose change in current. Changing current induces a back emf V = − L (Δ I /Δ t ). This is considered to be an effective resistance of the inductor to AC. The rms current I through an inductor L is given by a version of Ohm’s law:
Is the inductor always in the 90deg phase?
That’s not a normal, pure-AC situation where the inductor’s voltage is always 90deg shifted. Remember: inductor current in a pure AC circuit should always be at 90deg phase relative to inductor voltage. For pure AC situations, inductor current and voltage are never zero at the same time.
What is the instantaneous power of an inductive circuit?
Things get even more interesting when we plot the power for this circuit: In a pure inductive circuit, instantaneous power may be positive or negative. Because instantaneous power is the product of the instantaneous voltage and the instantaneous current (p=ie), the power equals zero whenever the instantaneous current or voltage is zero.