Electrical Laws

Ohm's Law Coulomb's Law Kirchoff's Law Faraday's Law Ampere's Law Joule's Law Lenz's Law Biot Savart Law

Electrical Theorems

Thevenin Theorem Nortons Theorem Super Position Theorem Reciprocity Theorem Compensation Theorem Maximum Power Transfer Millmans Theorem Tellegans Theorem

Electrical Rules

Flemings Left Hand Rule Flemings Right Hand Rule Cork Screw Rule

Electrical Network

Network Terminologies

Electrical Terms

Electrical Terms Materials Capacitors Resistors Inductor Self Inductance Mutual Inductance Magnetic Flux Magnetic Characteristics EMF MMF Permeability Sources Reluctance Torque

Electrical Transformer

Transformers How Transformer Works Transformer Classifications Types Transformers Core Type Transformers Ideal Transformers Parallel Operation Transformer Cooling Transformer Forces Transformer Losses Transformer Testing Transformer Bushing Transformer Windings

Types of Transformer

Auto Transformer Current Transformer Potential Transformer Rectifier Transformer Converter Transformer

AC Motor

Stator and Rotor Three Phase Induction Motor Induction Motor Transformer

AC Generator

AC Generators Alternator Stator Construction Alternator Rotor Construction Alternator - Parallel Operation Synchronizing AC Alternator Losses in Alternator

DC Motors

DC Motors Commutator Braking of Electric Motors Dynamic Rheostatic Braking Regenerative Braking Plugging Braking Speed Control DC Motor Losses DC Motors

Types Of DC Motor

DC Motors Types DC Series Motors DC Shunt Motors DC Compound Motor Brushless DC Motors Permanent Magnet DC Motor

Starter For DC Motors

Starters DC Motors

DC Generator

DC Generator Types DC Generators Sparking DC Generators Why Generator Overloading Losses DC Generators

Parallel Operation

PO - DC Generator Series DC Generator Shunt DC Generator Compound DC Generator
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Electro Motive Force - EMF

Electro Motive force, well known as emf, is the maximum potential difference between two electrodes of a battery or galvanic cell. By fact, electrical energy is not available directly from the nature. Emf converts chemical, mechanical, and other forms of energy into electrical energy.

Induced EMF

Whenever a conductor is placed in a varying magnetic field, emf is induced in the conductor, which causes the current to flow through the conductor. This emf is called induced emf.

Statically induced EMF

When the conductor is in stationary and the magnetic field is varying then an emf is induced in the condutor. This type of emf is called statically induced emf. In transformer the emf is induced statically

Dynamically induced EMF

When the magnetic field is stationary and the conductor is varying i.e) cutting the flux line produced by the magnetic field then the emf is induced in the conductor. This type of emf is called dynamically induced emf. DC generator works under the principle of dynamically induced emf.

Self induced EMF

The EMF induced in a coil due to change in flux linkage when a changing current flows through the coil. This type of emf is called self induced emf. DC generator works under the principle of self induced emf.

Mutually induced EMF

When a secondary winding or a coil is brought near a primary winding or a coil which producing changing flux, then EMF will be induced in the second coil due to change in current in the first coil. This type of emf is called Mutually induced emf Transformer works under the principle of mutually induced emf.

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