How Electromotive Force Works
National MagLab・2 minutes read
EMF is the voltage generated by a battery or changing magnetic field, while back EMF is induced by inductors, diverting current flow towards a light bulb in a circuit with a coil, battery, switch, and light bulb. Inductors store energy in magnetic fields, inducing a voltage when the magnetic field changes, with back EMF initially favoring the light bulb before the inductor once the magnetic field reaches maximum strength.
Insights
- EMF, or electro-motive force, is the voltage produced by batteries or changing magnetic fields, while back EMF, also called counter EMF, is created by inductors in circuits, resisting current flow and redirecting it to light bulbs.
- Inductors possess the ability to accumulate energy in magnetic fields, leading to voltage induction when these fields shift. In circuits involving coils, batteries, switches, and light bulbs, back EMF initially guides current towards the bulb, transitioning to favor the inductor as the magnetic field attains peak intensity.
Get key ideas from YouTube videos. It’s free
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?
Inducing a voltage when magnetic field changes.
What happens in a circuit with a coil, battery, switch, and light bulb?
Back EMF diverts current towards the bulb initially.
Why does back EMF divert current towards the bulb?
Opposing the current flow and protecting components.
Related videos
PW - Hindi Medium
विद्युत चुम्बकीय प्रेरण in One Shot | कक्षा 12वी /JEE /NEET | Electromagnetics Induction
Competition Wallah
ELECTROMAGNETIC INDUCTION - EMI in One Shot - All Concepts & PYQs | NEET Physics Crash Course
Apni Kaksha Official
Electromagnetic Induction - Class 12 Physics | NCERT for Boards & CUET
Vedantu Telugu
ElectroMagnetic Induction 01 : Faraday's Law | Motional EMF | JEE/NEET/EAMCET 2024 | Vedantu Telugu
Professor Dave Explains
Electric Charge and Electric Fields
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 initially before favoring the inductor once the magnetic field reaches its maximum strength.
