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Which device converts mechanical energy into electrical energy through electromagnetic induction?
Battery
Electric motor
Electric generator
Capacitor
Electric motor
An electric generator is the device that converts mechanical energy into electrical energy based on Faraday's law of electromagnetic induction. The provided official answer key is incorrect; an electric motor performs the opposite function, converting electrical energy into mechanical energy.
An electric generator is the device that converts mechanical energy into electrical energy based on Faraday's law of electromagnetic induction. The provided official answer key is incorrect; an electric motor performs the opposite function, converting electrical energy into mechanical energy.
Think of a bicycle dynamo: as you pedal (mechanical energy), the rotating magnet inside a coil creates electricity (electrical energy) to light up your headlight.
Remember 'G-M-E' for Generator: Mechanical to Electrical. Use 'M-E-M' for Motor: Electrical to Mechanical.
╧╡=тИТNdtd╧ХтАЛ тАФ Faraday's Law of Electromagnetic Induction
╬ж=BтЛЕAcos(╬╕) тАФ Magnetic Flux
As a conductor or coil moves within a magnetic field, the magnetic flux linkage changes, inducing an electromotive force (EMF) across the conductor. This is governed by Faraday's Law, where the magnitude of induced EMF is ╧╡=тИТNdtd╧ХтАЛ. The direction of the induced current is determined by Fleming's Right-Hand Rule.
Generators operate on electromagnetic induction (Faraday's Law).
Motors operate on the magnetic effect of current (Lorentz Force).
Fleming's Right-Hand Rule is used for generators; Fleming's Left-Hand Rule is for motors.
High efficiency in power generation
Scalable from small portable units to large power plants
Requires an external prime mover (e.g., turbine, engine)
Subject to mechanical wear and tear
Thermal, hydro, and wind power plants
Portable power generators for backup
| Feature | Electric Generator | Electric Motor |
|---|---|---|
Energy Conversion | Mechanical to Electrical | Electrical to Mechanical |
The official key provided (Option B) is factually incorrect as it defines a motor, not a generator.
Battery: Converts chemical energy into electrical energy via redox reactions.
Capacitor: Stores energy in an electric field between two plates.
C is correct тАФ An electric generator uses electromagnetic induction to transform mechanical work into electrical energy.
In competitive exams, if you spot an error in the provided key, trust the fundamental laws of physics; generators always produce power (Mechanical to Electrical).