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  1. Electromagnetism
  2. Introduction to Electromagnetism
  3. Transofmers and Transfomers Equation
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Introduction to Electromagnetism
Electromagnetic Induction
Magnetic Flux and Faraday's Law of Electromagnetic Induction
Magnetic Flux and Faraday's Law Example
Lenz's Law
Lenz's Law Examples
Using Lenz's Law to Find Direction of Induced Current
Magnetic Flux and Induced Current Example
Motional emf
Motional emf Example # 1
Motional emf Example # 2
Electromagentic Blood Flow Meter and Motional emf
Electric Generators
Electric Generator Example
Counter Torque in Electric Generators
Eddy Currents
Transofmers and Transfomers Equation
Transformers Equation Example
Power Transmision and Transformers Example
Changing Magnetix Flux Produces Electric Field
Self and Mutual Inductance
LR Circuits, LC Circuits and LCR Circuits
Electromagnetic Waves and Maxwell's Equations

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Transofmers and Transfomers Equation

Content Provider AK Lectures
Description The alternating current produced inside electric generators within power plants travels to major towns and cities through transmission lines (also known as power lines). If the voltage inside the wire is too low, most of the electric power will be lost due to heat inside the wire as a result of the wire's resistance. To solve this problem, we must increase the voltage to a much higher value. By increasing the voltage, we are decreasing the value of the electric current and therefore decreasing the loss of power as a result of the resistance. To increase and decrease the voltage within the power line, we use a device known as a transformer. A transformer consists of a primary and secondary coil that differ by the number of loops of wire in the coil and which are linked by a laminated iron rod. The rod is laminated as to minimize the occurrence of eddy currents inside the iron. A transformer works on the principle of mutual inductance (which will be discussed in a future lecture). The alternating current in the primary coil creates a changing magnetic field inside the rod that travels to the other end and through the loops of the secondary coil. This produces a changing magnetic flux inside the loops of the secondary coil and this induces an emf (by Faraday's Law), which in turn produces a current. A step-up transformer contains more loops of wire on the secondary coil than the primary while a step-down transformer contains more loops on the primary than secondary coil. The transformers equation can be used to determine the voltage increase or decreasing knowing the number of loops of wire in each coil.
Language English
Access Restriction Open
Subject Keyword Classical Physics coil loss inductance cities towns iron flux Faraday emf
Content Type Video
Educational Role Teacher Student
Educational Use Self Learning Lecture Reading
Resource Type Video Lecture
Education Level Under Graduate
Subject Electricity & electronics
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