3 Review A material through which electrons can move easily is a _____. A. conductorB. insulatorC. nucleusD. electromagnetic
4 ReviewEach of the following is an example of an insulator except _____.A. woodB. copperC. glassD. rubber
5 Review An atom has equal numbers of protons and _____. Neutrons ElectronsOhmsVolts
6 Review Every proton and electron is surrounded by a(n) _____. A. electric circuitB. electric fieldC. insulatorD. magnetic pole
7 Today’s Goals… I can describe how an electric current flows. I can explain how electrical energy is transferred in a circuit.Study Pack #10Page 201
8 What do you know? True or False In a wire there is an electric current when protons in the wire move along the wire.The unit for electric current is the ampere.Electric currents will flow when a switch is open.Batteries can produce an electric field that makes electric charges flow.
9 What is an electrical current? The flow of electrical chargesElectrons move along the wire
10 Unit for CurrentThe amount of electrical current in a wire is the amount of charge that flows into and out of the wire every secondThe unit for current is the ampere, A1 ampere of electric current means about six billion billion electrons flowing into and out of the wire every second
11 A Simple Electric Current Electric energy can be transformed into heat, light, and sound energyTo watch tv energy must be constantly transformedThe electric current must be kept flowing
12 A Simple Electric Current Electric current will flow continually in a CLOSED path called an electrical circuit
13 A Simple Electric Circuit An electrical circuit is made up of:wire, which connects the parts togetheran energy source, such as a batterya receiver, such as a fan, lightbulb, or motora switch (not required)
14 A Simple Electric Current Current flows as long as the switch is closedWhen the switch is open, current no longer flowsIf one of the wires are cut or the light bulb is unscrewed the current will not flow
15 Making Electric Charges Flow A force must be exerted on electric charges to make them flowForce is exerted on an electric charge by an electric fieldThere is an electric field in the circuit that will move electrons in a single direction
16 Making Electric Charges Flow A battery can produce an electric fieldElectrons flow from the negative end to the positive end
17 What did you learn? True or False In a wire there is an electric current when protons in the wire move along the wire.The unit for electric current is the ampere.Electric currents will flow when a switch is open.Batteries can produce an electric field that makes electric charges flow.