physics investigatory on electromagnetic induction
TRANSCRIPT
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
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic Induction
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
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
Increasing the voltage
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
Increasing the voltage
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
Increasing the voltage
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
Generators and DynamosGenerators and DynamosGenerators and DynamosGenerators and Dynamos
Generators and Dynamos
Generating ElectricityGenerating ElectricityGenerating ElectricityGenerating Electricity
Generating Electricity
GeneratorGeneratorGeneratorGenerator
Generator
DynamoDynamoDynamoDynamo
Dynamo
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
TransformersTransformersTransformersTransformers
Transformers
TransformersTransformersTransformersTransformers
Transformers
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
Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
Transformers
Step up TransformerStep up TransformerStep up TransformerStep up Transformer
Step up transformer
Step down TransformerStep down TransformerStep down TransformerStep down Transformer
Step down transformer
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