2 CircuitsDefinition: circuit – a set of components that allow one or more complete paths for electric current to flow.Any time electricity is flowing, a circuit is present.
3 CircuitsWhen electricity is able to flow freely through a circuit, that circuit “closed”.Incomplete circuits will not allow electricity to flow freely.They are called “open” circuits.
4 Circuit Components Circuits consist of many different things. The most common components of a circuit are:Power SuppliesWiresResistorsBulbsSwitchesDefinition: resistor – a device that blocks SOME (not all) electric current in a circuit.Appliances like TV’s, lights, computers…these are all resistors.
5 Basic Circuit Symbols (copy these to notes!) ResistorWireBattery orPower SourceBulbOpen SwitchClosed Switch
6 Types of CircuitsDefinition: series circuit – a circuit that forms a single pathway.Electricity can only flow one way in a series circuit.
7 Types of CircuitsDefinition: parallel circuit – a circuit that forms multiple pathways for electricity.Parallel circuits can have a piece removed from them and still allow electricity to flow in another part of the circuit.
9 Electric Current in wires…. Electric resistance explains why electronics get hot as they run.Even conductors cause some resistance.As a wire gets thicker, there is less resistance.Lots of ResistanceSome ResistanceLittle resistance
10 Electric Current in wires…. As a wire gets shorter, there is less resistance.Lots of ResistanceSome ResistanceLittle resistance
11 Electric Current in wires…. As a wire gets thicker it can carry more electric current.