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Today’s Agenda…11/17 • Bellringer: Worksheet • Review Note-taking Worksheet & Discuss • Notes on Electric Current Part I Electric Current Part I Study Pack #10 Review • A material through which electrons can move easily is a _____. • A. conductor • B. insulator • C. nucleus • D. electromagnetic Review • Each of the following is an example of an insulator except _____. • A. wood • B. copper • C. glass • D. rubber Review • An atom has equal numbers of protons and _____. • Neutrons • Electrons • Ohms • Volts Review • Every proton and electron is surrounded by a(n) _____. • A. electric circuit • B. electric field • C. insulator • D. magnetic pole Today’s Goals… • I can describe how an electric current flows. • I can explain how electrical energy is transferred in a circuit. • Study Pack #10 • Page 201 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. What is an electrical current? • The flow of electrical charges • Electrons move along the wire Unit for Current • The amount of electrical current in a wire is the amount of charge that flows into and out of the wire every second • The unit for current is the ampere, A • 1 ampere of electric current means about six billion billion electrons flowing into and out of the wire every second A Simple Electric Current • Electric energy can be transformed into heat, light, and sound energy • To watch tv energy must be constantly transformed • The electric current must be kept flowing A Simple Electric Current • Electric current will flow continually in a CLOSED path called an electrical circuit A Simple Electric Circuit • An electrical circuit is made up of: – wire, which connects the parts together – an energy source, such as a battery – a receiver, such as a fan, lightbulb, or motor – a switch (not required) A Simple Electric Current • Current flows as long as the switch is closed • When the switch is open, current no longer flows • If one of the wires are cut or the light bulb is unscrewed the current will not flow Making Electric Charges Flow • A force must be exerted on electric charges to make them flow • Force is exerted on an electric charge by an electric field • There is an electric field in the circuit that will move electrons in a single direction Making Electric Charges Flow • A battery can produce an electric field – Electrons flow from the negative end to the positive end 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.