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
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Electrical Terms

"Energy can neither be created nor be destroyed". Fortunately we can change its forms, using appropriate energy - conversion methods (or) processes.

Characteristics of Electrical Energy

An interesting facts about electrical energy is that neither it is available directly from nature nor it is finally consumed by any of the electrical and electronics systems (or) devices. It is so hard to believe, Let us go through a instance.

How does a ceiling fan rotates?

  • A ceiling fan uses Capacitor start and run type Single phase Induction motor.
  • According to Motor's principle "whenever a current carrying conductor is placed in a magnetic field, A conductor will experience a mechanical force on it, which tends it to rotate whose direction is given by Fleming's Left-hand Rule".
  • When a stator of 1Փ Induction motor is supplied by 1Փ ac supply ,a current will produce in the stator winding and resulted in formation of main flux.
  • This main flux cuts the rotor conductor of 1Փ Induction motor.
  • By Faraday's law of electromagnetic induction , emf will induced in the rotor, as the rotor circuit is closed.
  • Emf which is induced in the rotor produces it own flux called rotor flux.
  • Now, the main flux (produced by the stator) and rotor flux (produced by the rotor) create's the desired torque which is required by the 1Փ ac motor to rotate.
  • Unfortunately, By double field revolving theory, the main flux and the rotor flux produced by the 1Փ Induction motor is equal and opposite. Hence they cancelled each other and the net torque experienced by the rotor at staring is zero.
  • To overcome this self starting problem we uses uses Capacitor start and run type Single phase Induction motor which produces rotating magnetic field to make the rotor to run at starting.
  • Thus we can conclude by the above example two flux is fair enough to rotate the fan blades, but to create that two fluxes electrical energy is get used.

Note:

1Փ Induction motor is not self starting.

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