Sahithyan's S1 — Electrical Fundamentals
Inductors
When there is a current in the inductor, a magnetic field is created. Any change in current causes the magnetic field to change, this in turn induces a voltage across the inductor that opposes the original change in current. The polarity of the induced magnetic field opposes the change in current.
A length of wire turned into a coil works as an inductor.
Inductance (L)
A property of electrical conductors. Measured in henries (). When the current through a conductor changes, an electromotive force (emf) is produced. the magnetic field around it changes.
For an ideal inductor:
Here:
- - voltage difference across the inductor
- - current through the inductor
Energy stored
Suppose current across an inductor rises from to during a time period of seconds.