Self-induction is the phenomenon in which a changing current in a coil of wire induces an electromotive force (emf) in the same coil. This emf opposes the change in current that produced it, according to Faraday's law of electromagnetic induction. Self-induction is a property of an inductor, which is a passive electronic component that stores energy in a magnetic field when current flows through it. It is also known as self-inductance or simply inductance.
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Google Gemini AI
Sep 5
Self-Induction
Self-induction is the phenomenon where a changing current in a coil of wire induces an electromotive force (EMF) in the same coil. This EMF is opposed to the change in current and is proportional to the rate of change of current.
Cause:
When current flows through a coil of wire, it creates a magnetic field. As the current changes, the magnetic field also changes. This changing magnetic field induces an EMF in the coil, according to Faraday's law of electromagnetic induction.
Direction:
The direction of the induced EMF opposes the change in current. This is known as Lenz's law. If the current is increasing, the induced EMF will be in the direction that opposes the increase. If the current is decreasing, the induced EMF will be in the direction that opposes the decrease.
Mathematical Expression:
The self-induced EMF is given by the following equation:
``` ε = -L - (dI/dt) ```
Where:
- ε is the self-induced EMF - L is the inductance of the coil - dI/dt is the rate of change of current
Inductance:
Inductance (L) is the property of a coil that opposes changes in current. The larger the inductance, the greater the self-induced EMF and the more it resists changes in current. Inductance is measured in Henrys (H).
Applications:
Self-induction has numerous applications, including:
- Inductors in electrical circuits to store energy and limit current flow - Transformers to transfer electrical energy between circuits - Motors and generators to convert mechanical energy to electrical energy and vice versa - Antennas to transmit and receive electromagnetic waves
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Collins Benton
Sep 6
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