Electromagnetic Induction
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Electromagnetic induction occurs when a magnet moves in and out of a coil of wire, causing a current to flow in the wire. The size of the induced voltage can be increased by moving the magnet or wire faster, using a stronger magnet, adding more turns to the coil, or using a larger coil area. Generators and dynamos produce electricity by rotating a coil of wire within a magnetic field or rotating a magnet within a coil, while transformers change the voltage of alternating current by using a changing magnetic field in one coil to induce a voltage in another coil.
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- Electromagnetic induction is the process of generating current through a wire in a changing magnetic field. When a wire moves perpendicular to a magnetic field, charges in the wire move and create an induced electromotive force (EMF).
- Transformers use electromagnetic induction to increase or decrease alternating current voltages. They have primary and secondary coils wound around an iron core. The ratio of turns determines the ratio of voltages.
- Lenz's law states that the direction of the induced current is such that the magnetic field it creates opposes the original change in magnetic flux that caused it. This induced magnetic field allows transformers, motors, and generators to function.
Transfomer
Here are the solutions to the transformer problems:
1. A transformer has 100 turns on coil 1 and 200 turns on coil 2.
i. If the voltage on coil 1 is 10 volts, the voltage on coil 2 will be 20 volts (Voltage on coil 2 = Voltage on coil 1 x Turns on coil 2/Turns on coil 1 = 10V x 200/100 = 20V)
ii. If the voltage on coil 1 is 200 volts, the voltage on coil 2 will be 400 volts (Voltage on coil 2 = Voltage on coil 1 x Turns on coil 2/Turns on coil 1 = 200V x 200/100 = 400V)
iii.
Generators transformers
Generators produce alternating current (AC) by rotating a coil inside a magnetic field or rotating a magnet inside a coil. This causes the magnetic field to cut through the coil, inducing a current that changes direction with each half rotation. Transformers work with AC by using two coils: a changing current in one coil induces a current in the other coil at a different voltage level. Power plants generate three offset phases of AC that are transformed to higher voltages for transmission on power lines before being transformed to lower voltages for household use.
X-Ray Generators.pptx
This document discusses components of an X-ray generator including an X-ray tube containing a cathode and anode, as well as a cooling system. It also discusses transformers, describing their principle of electromagnetic induction and how they work to increase or decrease voltage. Key components of transformers like the core and windings are explained. Rectifiers are also summarized, including the principles of half-wave and full-wave rectification.
THE TOPIC OF TRANSFORMER. PHYSICS SLIDES NOTES FOR FORM 4
A transformer is a device that changes voltage from one level to another. It has a primary coil and secondary coil. Alternating current flowing through the primary coil induces an electromagnetic field that cuts through the secondary coil, inducing voltage in it. The ratio of turns in the coils determines whether voltage is stepped up or down. Power is lost in transformers through resistance in the windings, eddy currents induced in the core, hysteresis losses from magnetizing/demagnetizing the core, and magnetic flux leakage not cutting the secondary coil. Losses are minimized through techniques like using thick copper wires, laminating the core, using soft-iron cores, and optimizing the magnetic flux path.
Transformer.pptx
This document provides information on transformers. It begins with an introduction that explains transformers are used to transfer electrical energy between AC circuits by changing the voltage and current levels. It then discusses the basic components and principles of how transformers work, including that an alternating current in the primary winding induces a voltage in the secondary winding via electromagnetic induction without a direct electrical connection. The document also covers different types of transformers like step-up, step-down, variable and autotransformers as well as their functions and uses. It concludes by explaining how laminating the iron core reduces eddy current losses.
Electromagnetic Induction
Is a short and clean presentation power point slide for both both Engineering and Physics students and teachers.
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A perfect PPT on Transformer including - Intro. , Defn , Construction , Working , Types , Etc. by Abhay M. Laxane
Electromagnetic induction
The document discusses different types of meters used to measure electric voltage and current, including moving iron, hot wire, and thermocouple meters. It then provides details on the construction and working principles of moving iron meters, which use magnetic forces to deflect a pointer on a scale. The document also covers electromagnetic induction, explaining how a changing magnetic field can induce voltage in a conductor. Key concepts discussed include mutual and self induction, inductive reactance, eddy currents, and the workings of transformers, autotransformers, and dynamos based on electromagnetic induction.
Everything about tansformers/Transformers/working process of transformers
A transformer is a device that transfers electrical energy between two circuits through electromagnetic induction. It consists of two coils wound around an iron core. The primary coil is connected to a power source and the secondary coil is connected to a load. An alternating current in the primary coil induces a magnetic field that links to the secondary coil, inducing voltage in it. There are step-up transformers, which increase voltage, and step-down transformers, which decrease voltage. Transformers are used efficiently in the national power grid to transmit electricity over long distances at high voltages to reduce energy loss, before stepping voltages back down for safe distribution to homes.
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Electromagnetic Induction
- 2. Electromagnetic Induction Electromagnetic Induction
- 3. Electromagnetic Induction Electromagnetic Induction
- 4. Electromagnetic Induction Electromagnetic Induction
- 5. Electromagnetic Induction Electromagnetic Induction
- 6. Electromagnetic Induction Electromagnetic Induction
- 8. Increasing the voltage Increasing the voltage
- 9. Increasing the voltage Increasing the voltage
- 11. Generating Electricity Generating Electricity
- 13. Dynamo Dynamo
- 17. Transformers Step-up & Step-down Transformers
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- 21. Quiz Quiz