electricity lesson
TRANSCRIPT
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ELECTRICITY
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Electricity is the energy caused by the flow of electrons.
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Charge and Static ElectricityChapter 17
Static Electricity : A BUILD UP OF CHARGE (electrons) on an object!
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Static electricity by friction and conduction
1. Friction: build up of charge by rubbing one object against another.
Rubbing hair with balloon
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2. Conduction: build up of charge by direct contact between 2 objects
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Current electricity• Current is a flow of electric charges. It is not a build up of
charge that is discharged.
• All current electricity needs a circuit (a close pathway for electric charges to flow).
• All circuits must have at least 3 parts : 1) wires, 2) a source 3) a load(s).
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Parts of a circuit
wires Source of electricity
Load
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Conductors
• Conductor: a material that easily allows the flow of electric charges.
• It gives very little resistance to the flow of charge. ( metals – copper, aluminum , etc )
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Insulators
• Insulators: They don’t easily allow the flow of electric charges through them.
• Ex: glass, plastic, certain rubber materials, cloth.
WIRE
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Types of circuits
• http://www.brainpop.com/science/energy/electriccircuits/http://www.brainpop.com/science/energy/electriccircuits/
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Types of circuits
• 1. Series Circuit: only 1 path for the electric charges to flow
• 2. Parallel Circuit: has More than one path for the electric charges to flow.
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Series circuit
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2. Parallel Circuit: has more than 1 path for electric charges to flow, so if 1 load goes “out,” the other loads will still work !
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Draw a parallel circuit
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SWITCHES
• A switch is a device that opens or closes a circuit. When you switch on a lamp, you close the circuit. When you switch off a lamp, you open the circuit.