Table of Contents
- 1 Why does an inductor opposes change in current?
- 2 How does current change in an inductor?
- 3 Why does current lag in inductor voltage?
- 4 What is the polarity of the current during discharge state in inductor?
- 5 Why does the current change direction when an inductor is used?
- 6 How to determine if an inductor is charging or discharging?
Why does an inductor opposes change in current?
The current, i that flows through an inductor produces a magnetic flux that is proportional to it. But unlike a Capacitor which oppose a change of voltage across their plates, an inductor opposes the rate of change of current flowing through it due to the build up of self-induced energy within its magnetic field.
How does current change in an inductor?
The current in an inductor cannot change instantaneously because it implies an infinite voltage will exist, which isn’t going to happen. This reluctance to change is because of the energy stored in the inductor’s magnetic field. The current in an inductor does not (will not) change instantaneously.
What happens when inductor discharges?
Inductors have the exact opposite characteristics of capacitors. A fully discharged inductor (no magnetic field), having zero current through it, will initially act as an open-circuit when attached to a source of voltage (as it tries to maintain zero current), dropping maximum voltage across its leads.
Are inductors directional?
Sometimes there is a mark on inductors to distinguish direction. We therefore leave a mark so that the user will know the inductor has directionality. That way, when they use the inductor, they can hope to make the fullest use of the intended properties.
Why does current lag in inductor voltage?
In circuits with primarily inductive loads, current lags the voltage. This happens because in an inductive load, it is the induced electromotive force that causes the current to flow. The induced electromotive force is caused by a change in the magnetic flux linking the coils of an inductor.
What is the polarity of the current during discharge state in inductor?
If there is no such path, the energy will drop gradually due to magnetic flux. While charging, the current flow suppose right to left. After completing the charging if you disconnect, suddenly the polarity of the inductor will change (Left to right). So the discharge current flow in opposite direction.
Why does an inductor act as an open circuit?
When the switch is first closed, the current through the inductor is zero, because it cannot change instantaneously. This means that the inductor acts like an open circuit, so all the voltage is across the inductor. The changing magnetic field creates a back emf which acts to oppose the current in the inductor.
Do inductors polarity?
Unlike capacitors or diodes, inductors do not have a functional polarity, and they work equally in either direction.
Why does the current change direction when an inductor is used?
Actually the current does not change direction. An inductor resists changes to the flow of current. What happens is the polarity across the inductor changes direction. Drive a current into an inductor with (say) positive at end A and negative at end B, and the magnetic field increases.
How to determine if an inductor is charging or discharging?
If the inductor is taking the current from the source, the inductor is charging. If the inductor provides current to the load, the inductor is discharging. The current can be determined by using Kirchhoff’s Current Law at any load. The above discussion showed the following key point in detail.
Why does the discharge current flow in the opposite direction while charging?
If there is no such path, the energy will drop gradually due to magnetic flux. While charging, the current flow suppose right to left. After completing the charging if you disconnect, suddenly the polarity of the inductor will change (Left to right). So the discharge current flow in opposite direction.
What happens to the polarity of the inductor when charging?
While charging, the current flow suppose right to left. After completing the charging if you disconnect, suddenly the polarity of the inductor will change (Left to right).