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back emf
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back emf

physics
Also known as: Counter emf
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Quick Summary

Back electromotive force, also known as counter electromotive force, is a concept in physics related to Lenz's law. Lenz's law states that an induced electric current flows in a direction that opposes the change that caused it. For example, when a magnet is moved through a coil of wire, an electric current is induced. This induced current creates its own magnetic field, which opposes the motion of the original magnet. This opposition requires work, and the energy from this work is converted into heat due to the coil's resistance, upholding the principle of conservation of energy.12

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  1. back electromotive force
  2. Lenz's law
  3. Lenz’s law

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