electromagnetism and motion
TRANSCRIPT
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Electromagnetism and Motion
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Students will be able toDescribe a galvanometerExplain electric motorsExplain how generators workContrast AC/DC currentsDescribe how a transformers work
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Electrical Energy
Occurs when you have motion between magnets
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Galvanometers
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Take advantage of motion to measure small currents
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Motors
Three key partsArmature – Loop just like in galvanometer
Rotates in magnetic fieldBrushes – Carry charge from source
Do not moveCommutator – Carries current to armature
Attached to armature and moves.
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Motors
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Induction
When a wire moves through a magnetic field
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Induction
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Or move a magnet through wires
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Direct Current
DCThe electric current flows in one direction only
Batteries
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Alternating Current
ACCurrent repeatedly changes directionUsed in homes, school…Allows for easier control
Easily raised or loweredHigh for shippingLower for home
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Generators
The opposite of an electric motor
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Generators
Turbines
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Transformer
A device that can increase or decrease voltage
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Types
Step-up vs Step-down
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Devices
Big equipment – Step up voltageFluorescent lights, TV
Small stuff – Step downElectronic games, ipod, CD player… (12V)
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Question of Day
You are a television reporter covering the opening of a new dam that generates electricity. Write a short news story describing how a dam transforms mechanical energy from the motion of the water into electrical energy.