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Which of the following household appliances uses the principle of electromagnetic induction?
Toaster
Refrigerator
Electric Fan
Electric Iron
Electric Fan
An electric fan uses an AC induction motor which operates on the principle of electromagnetic induction. When an alternating current flows through the stator windings, it creates a rotating magnetic field that induces a current in the rotor, generating torque.
An electric fan uses an AC induction motor which operates on the principle of electromagnetic induction. When an alternating current flows through the stator windings, it creates a rotating magnetic field that induces a current in the rotor, generating torque.
Think of it like a dance; the magnetic field in the stationary part (stator) 'leads,' and the rotor follows the rhythm by spinning, even though they aren't physically touched by the same current source.
F-M-M: Flux, Magnetic field, Motion (The core components of induction motors).
╬╡=тИТNdtd╬жBтАЛтАЛ тАФ Faraday's Law of Induction representing induced EMF
F=I(L├ЧB) тАФ Lorentz force exerted on a current-carrying conductor in a magnetic field
The principle is based on Faraday's Law of Electromagnetic Induction and Lenz's Law. An alternating current in the stator creates a time-varying magnetic field, which induces an electromotive force (EMF) and subsequently a current in the rotor bars. According to the Lorentz force law, this induced current interacts with the magnetic field to produce a mechanical torque that rotates the fan blades.
Electromagnetic induction involves the generation of an electric current through a changing magnetic field.
Induction motors are highly efficient and durable due to the lack of brushes or commutators.
The stator is the stationary part, and the rotor is the rotating part of the motor.
High reliability
Low maintenance
Self-starting capability in polyphase systems
Speed control is difficult compared to DC motors
High starting current requirements
Ceiling fans and table fans
Industrial pumps and compressors
Toaster, Electric Iron, and Heater work on the Joule heating effect (H=I2Rt), not electromagnetic induction.
A refrigerator uses a motor-driven compressor, which also relies on induction, but within the context of basic home appliances listed, the Fan is the classic textbook example of an induction motor.
C is correct тАФ The electric fan utilizes an AC induction motor which converts electrical energy into mechanical energy using the principle of electromagnetic induction.
Always distinguish between heating appliances (Ohmic heating) and motor-driven appliances (Induction) in your physics preparation; heating appliances consume current to produce heat, while motor appliances use current to produce magnetic flux.
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