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Applications Of Electromagnetic Induction

Electric Generator

Electric Generator

An electric generator is a machinery that is able to convert kinetic energy into electrical energy using electromagnetic induction.

What is an electric generator

Diagram

The rotating shaft causes the magnet to spin, changing the direction of the magnetic field lines acting on the coil

  • Due to the magnetic field lines created by the magnet acting on the coil , the coil would create its own magnetic field in opposite direction to the magnetic field lines.

  • Because the magnet is spinning, the magnetic flux linkage acting on the coil would be constantly changing

  • The changes in the magnetic flux linkage induces an EMF in the coil, which then would induce a current when connected in a closed circuit.

  • Using the Right Hand Grip Rule, the direction of the current can be deduced based on the direction of the magnetic field generated by the coil.

  • Using the formula , the induced EMF can be calculated.

Theory behind the magic

It is used in hydro-machinery or wind turbines to generate electricity using renewable resources to power our everyday electrical appliances.

Uses of electric generators

Induction Heater

Induction Heater

An induction heater converts electrical energy into heat energy using the concept of electromagnetic induction and Eddy currents

Power supply

A high frequency alternating current is fed into the electromagnet, this causes the electromagnet to generate its own magnetic field

Electromagnetic Induction and flow of electrons

  • The magnetic field created by the electromagnet induces a magnetic field of an opposite direction on the heating element.

  • An alternating current power supply is used so the direction of the magnetic field generated is constantly changing.

  • The changing magnetic flux linkage acting on the heating element induces an EMF on the heating element with the positive and negative terminals constantly flipping.

  • Due to the constant flipping of terminals, the electrons on the heating element is constantly moving up and down, towards the positive terminal

Eddy Current

  • The flowing of electrons creates a flow of current in the heating element called Eddy Currents.

  • The current flowing is what causes the heating element to heat up

An induction heater is used when

an accurate, repeatable heating is required. It is also safe as there is no flame involved. It is quick and efficient as well, hence why it is used in various regions of the workforce such as a kitchen, laboratory or even an industrial factory

Advantages and uses of an induction heater

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