How Electromotive Force Works
National MagLab・2 minutes read
EMF and back EMF are generated by changing magnetic fields in circuits, with inductors opposing current flow and diverting it towards light bulbs due to the principles of electromagnetic induction. This process results in light bulbs briefly lighting up before fading as energy is stored and released in magnetic fields.
Insights
- EMF, or electro-motive force, is the voltage produced by a battery or changing magnetic field, while back EMF, induced by inductors, diverts current towards a light bulb in a circuit.
- Inductors store energy in magnetic fields, generating a voltage when the field changes, as seen in a circuit with a coil, battery, switch, and bulb, where back EMF, following Faraday's law, causes the bulb to briefly illuminate before dimming.
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Recent questions
What is EMF?
Voltage generated by battery or changing magnetic field.
What is back EMF?
Induced by inductors in a circuit.
How do inductors store energy?
Inductors store energy in magnetic fields.
What is Faraday's law of electromagnetic induction?
Back EMF diverts current towards the bulb.
How does back EMF affect a circuit?
Opposes current flow, diverts it towards bulb.
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Summary
00:00
Understanding EMF and Back EMF in Circuits
- EMF, or electro-motive force, is the voltage generated by a battery or changing magnetic field, while back EMF, also known as counter EMF, is induced by inductors in a circuit, opposing the current flow and diverting it towards the light bulb.
- Inductors store energy in magnetic fields, inducing a voltage when the magnetic field changes, as demonstrated in a circuit with a coil, battery, switch, and light bulb, where back EMF diverts the current towards the bulb due to Faraday's law of electromagnetic induction, causing it to briefly light up before fading.
