electricity lesson
Post on 15-Apr-2017
1.185 Views
Preview:
TRANSCRIPT
ELECTRICITY
Electricity is the energy caused by the flow of electrons.
Charge and Static ElectricityChapter 17
Static Electricity : A BUILD UP OF CHARGE (electrons) on an object!
Static electricity by friction and conduction
1. Friction: build up of charge by rubbing one object against another.
Rubbing hair with balloon
2. Conduction: build up of charge by direct contact between 2 objects
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).
Parts of a circuit
wires Source of electricity
Load
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 )
Insulators
• Insulators: They don’t easily allow the flow of electric charges through them.
• Ex: glass, plastic, certain rubber materials, cloth.
WIRE
Types of circuits
• http://www.brainpop.com/science/energy/electriccircuits/http://www.brainpop.com/science/energy/electriccircuits/
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.
Series circuit
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 !
Draw a parallel circuit
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.
top related