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Which device converts mechanical energy into electrical energy using Faraday's Law?
Electric Motor
Transformer
Electric Generator
Electromagnet
Electric Generator
An electric generator is a device that converts mechanical energy into electrical energy based on the principle of electromagnetic induction. It relies on the relative motion between a magnetic field and a conductor to induce an electromotive force (EMF).
IS 4722:2001 (Rotating Electrical Machines)
An electric generator is a device that converts mechanical energy into electrical energy based on the principle of electromagnetic induction. It relies on the relative motion between a magnetic field and a conductor to induce an electromotive force (EMF).
╬╡=тИТNdtd╬жтАЛ тАФ Faraday's Law of Induction where ╬╡ is induced EMF, N is number of turns, and ╬ж is magnetic flux.
╬╡=BтЛЕlтЛЕvтЛЕsin(╬╕) тАФ Motional EMF induced in a conductor moving in a magnetic field.
The generator operates on Faraday's Law of Electromagnetic Induction, which states that an EMF is induced in a conductor whenever there is a change in the magnetic flux linked with it. As mechanical force rotates the rotor (coils) within a stationary magnetic field (stator), the rate of change of magnetic flux (d╬ж/dt) induces an electrical voltage. This is represented by the formula ╬╡=тИТNdtd╬жтАЛ.
Mechanical energy is provided by prime movers like turbines (hydro, steam, or wind).
Energy conversion follows the principle of Lenz's Law, which determines the direction of the induced current.
Generators can produce Alternating Current (AC) or Direct Current (DC) depending on the construction and commutation mechanism.
High efficiency in energy conversion.
Scalability from small portable units to large power plant generators.
Reliability in industrial power generation.
Mechanical wear and tear requires regular maintenance.
Energy losses occur due to friction, air resistance, and copper losses (heat).
Power plants for grid electricity distribution.
Portable power backup systems and alternators in vehicles.
Option A: Electric Motor converts electrical energy into mechanical energy.
Option B: Transformer changes the level of AC voltage/current but does not perform energy conversion between mechanical and electrical forms.
Option D: Electromagnet converts electrical energy into magnetic energy.
C is correct тАФ An electric generator uses mechanical motion to produce electricity via electromagnetic induction.
Remember that generators and motors are essentially reverse processes of each other; motors use Fleming's Left-Hand Rule, while generators use Fleming's Right-Hand Rule.