electromagnetic induction
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Electromagnetic InductionTRANSCRIPT
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1. If a magnet is moved into a coil of wire a current is induced in the wire.
2. If the magnet is moved out of the coil the direction of the current is reversed
3. A wire, or coil of wire, cutting through a magnetic field will generate a voltage. This induced voltage causes a current to flow through the wire
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Electromagnetic Induction
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Electromagnetic Induction
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Electromagnetic Induction
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Electromagnetic Induction
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Electromagnetic Induction
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Electromagnetic Induction
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The size of the induced voltage can be increased if;
• the wire is moved faster• the magnet is stronger• the number of turns on the coil is
increased• the area of the coil is greater
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Increasing the voltage
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Increasing the voltage
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Increasing the voltage
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1. Electricity is generated by rotating a coil of wire in a magnetic field or by rotating a magnet inside a coil of wire. This is how a generator works
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Generators and Dynamos
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Generating Electricity
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Generator
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DynamoDynamoDynamoDynamo
Dynamo
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1. Transformers can be used to change the voltage of an a.c. supply.
2. A changing magnetic field in the primary coil induces a voltage in the secondary coil
3. Transformers only work with alternating voltage
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Transformers
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Transformers
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1. Step-up transformers produce high voltages so that little energy is lost in power lines (National Grid)
2. Step-down transformers reduce voltages before the electricity reaches our homes
3. Primary voltage/Secondary voltage = Number of turns on primary/Number of turns on secondary
Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
Transformers
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Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
Transformers
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Step up TransformerStep up TransformerStep up TransformerStep up Transformer
Step up transformer
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Step down TransformerStep down TransformerStep down TransformerStep down Transformer
Step down transformer
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