Chapter 16:Electricity Section 3 – Circuits.

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Presentation transcript:

Chapter 16:Electricity Section 3 – Circuits

Circuits Definition: 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.

Circuits When 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.

Circuit Components Circuits consist of many different things. The most common components of a circuit are: Power Supplies Wires Resistors Bulbs Switches Definition: resistor – a device that blocks SOME (not all) electric current in a circuit. Appliances like TV’s, lights, computers…these are all resistors.

Basic Circuit Symbols (copy these to notes!) Resistor Wire Battery or Power Source Bulb Open Switch Closed Switch

Types of Circuits Definition: series circuit – a circuit that forms a single pathway. Electricity can only flow one way in a series circuit.

Types of Circuits Definition: 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.

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 Resistance Some Resistance Little resistance

Electric Current in wires…. As a wire gets shorter, there is less resistance. Lots of Resistance Some Resistance Little resistance

Electric Current in wires…. As a wire gets thicker it can carry more electric current.