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Circuits
+Why can’t you use lightning to power electrical devices?
Lightning releases large amount of electricity.
Devices need CURRENT to flow.
+What is electric current?
Continuous flow of electrons through a material
+What is the rate of electric current?
Amount of charge that passes through a wire in an amount of time
+What is an Ampere or amp?
Amount of charge flowing past a point each second
Andre Marie Ampere
+Wire A or Wire B. Wire A has more amps…
More amps means more electricity flowing
There is more charges (electrons) flowing in wire A than in wire B.
+Does electric current automatically exist in a material? NO WAY!!!
What does it need?
A specific and completed path to flow or follow
+To produce electric current…
Charges must flow from one place to another
+What is an electric circuit?
A complete, unbroken path through which electrons can flow
+Why is a racetrack like an electric circuit?
Cars can flow in a complete loop. If a piece is missing the cars can’t move.
+What would happen if a piece of the racetrack was removed?
Current couldn’t flow, so the cars couldn’t move.
+Closed versus Open
Closed Circuit
Closed, complete, unbroken path
Open Circuit
Incomplete or broken path
+What features do all circuits have?
1. Device run by electrical energy called a resistor
2. Source of electrical energy
3. Connected by conducting wire
+What are the roles of the following in a circuit?
Energy Source Makes charges move around or flow in a circuit
Resistor Transforms electrical energy into something (like light)
Switch Opens and closes the circuit
+Racetrack
+Racetrack
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+Symbols
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