Electricity Physics 3: Current

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Presentation transcript:

Electricity Physics 3: Current Science 9 Electricity Physics 3: Current

Objectives By the end of the lesson you should be able to: Explain the difference between static and current electricity Describe current Know the 8 symbols for electric circuits

Remember… Static Electricity is the build up of positive or negative charges

Moving Electrons Because we can attract and repel electrons we can get them to move Because we can move them we can get them to do work for us!!

Moving Electrons To make electrons move we need: A source of electrons (i.e. a cell) Something to attract or repel them (i.e. positive/negative terminals) Somewhere for them to move to (i.e. copper wire) THIS IS AN ELECTRIC CIRCUIT!

The 2 Variables When electrons move through a circuit there are two things to keep in mind: How many electrons are there? How much energy do they have?

Number of Electrons The amount of electrons flowing through a circuit is called the CURRENT Current in measured in Amps (A) by an Ammeter 1 amp = 1 coulomb sec Remember a 1C = 6.24 X1018 electrons

Circuit Flow Electron Flow: Electrons are repelled by negative end of cell Electrons are attracted by positive end of cell Electrons move from negative to positive Conventional Current: Flows from positive to negative Doesn’t actually happen!!!

Drawing Circuits Always in a rectangular shape Must use a ruler Lines represent wires Use appropriate symbols to represent parts of the circuit All circuits have: source, load, conductor, switch

Circuit Symbols Cell Light bulb Wires Ammeter Voltmeter Resistor Fuse Open Switch Closed Switch A V