Contents
- 1 When an inductor is connected to an AC source the current leads the voltage by 90 degree?
- 2 When an inductor is connected across an AC voltage source?
- 3 How is an inductor different from an AC power source?
- 4 What happens when voltage is applied to an inductor?
- 5 When does the current peak in an AC circuit?
When an inductor is connected to an AC source the current leads the voltage by 90 degree?
In both cases the phase angle is 90 degrees. When an alternating-current voltage is connected across an inductor, the phase of the current through the inductor lags the voltage by 90°.
When an inductor is connected across an AC voltage source?
If a pure inductor is connected across the ac source, the average power taken by the inductor is. Answer: (C) zero watt. Explanation: In the positive half cycle of power waveform ideal inductor takes energy from the source.
Can inductor pass AC?
The inductor stores electrical energy in the form of magnetic energy. The inductor does not allow AC to flow through it, but does allow DC to flow through it.
How is an inductor different from an AC power source?
An inductor is simply a coil of wire (often wrapped around a piece of ferromagnet). If we now look at a circuit composed only of an inductor and an AC power source, we will again find that there is a 90° phase difference between the voltage and the current in the inductor.
What happens when voltage is applied to an inductor?
When a sinusoidal voltage is applied to an inductor, the voltage leads the current by one-fourth of a cycle, or by a 90º phase angle. Current lags behind voltage, since inductors oppose change in current. Changing current induces a back emf V = − L (Δ I /Δ t ).
How are resistors and inductors related in a circuit?
In a circuit which only involves resistors, the current and voltage are in phase with each other, which means that the peak voltage is reached at the same instant as peak current. In circuits which have capacitors and inductors (coils) the phase relationships will be quite different.
When does the current peak in an AC circuit?
If we now look at a circuit composed only of an inductor and an AC power source, we will again find that there is a 90° phase difference between the voltage and the current in the inductor. This time, however, the current lags the voltage by 90°, so it reaches its peak 1/4 cycle after the voltage peaks.