IGCSE+ELECTROMAGNETIC+INDUCTION

Back to MAGNETISM AND ELECTROMAGNETISM =ELECTROMAGNETIC INDUCTION= 6.15 recall that a voltage is induced in a conductor when it moves through a magnetic field or when a magnetic field changes through a coil; also recall the factors which affect the size of the induced voltage [|HOW ELECTROMAGNETIC INDUCTION WORKS] Java applet [|ENERGY WORLD WEBSITE ON GENERATORS, TRANSFORMERS AND ENERGY AROUND THE HOUSE] Start with Electricity in your Home and then try the other activities on this excellent website

ELECTROMAGNETIC INDUCTION: A changing magnetic field through a conductor will induce a voltage in the conductor. The voltage is greater when the change is greater (larger field or faster movement).

6.16 describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field; also describe the factors which affect the size of the induced voltage.



GENERATOR/ DYNAMO: A device which induces a voltage when a magnet rotates in a coil or vice versa. A larger voltage is induced when the rotation is faster, the field greater or there are more turns in the coil. A simple generator produces an alternating current in a circuit.

[|HOW THE GENERATOR WORKS] Eon website

[|FARADAY ELECTROMAGNETIC LAB PHET] simulation or download from Studywiz

6.17 recall the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides.



TRANSFORMER: A device which allows an input AC voltage to be stepped up or down using electromagnetic induction.

[|HOW A TRANSFORMER WORKS] Java applet

6.18 explain the use of step-up and step-down transformers in the large-scale generation and transmission of electrical energy



[|ELECTRICAL TRANSMISSION USING HIGH VOLTAGE] Java applet

6.19 recall and use the relationship between input (primary) and output (secondary) voltages and the turns ratio for a transformer.

[|PRACTICE MC QUESTIONS ON TRANSFORMERS]


 * 6.20 recall and use the relationship for 100% efficiency. **