Unit 8 - Circuits
Circuit Circuit DiagramsDiagrams
Circuits: made up of wires and parts such as ________, light bulbs, _______, or switches.
When diagramming circuits, use ________ to represent parts of the circuit.
Common Electrical Symbols
Straight lines represent
wires.
Battery
Resistor Light Bulb
Switch
NOTE: In many circuit diagrams, any electrical device is shown as a resistor. A resistor is an electrical component that uses energy. Sometimes when showing how a circuit works, light bulbs might be treated like resistors.
Open vs Closed Circuits• Electricity _______ travel through an open
circuit: path is broken.• Electricity can travel easily through a ______
_______: there is a complete path.• A short circuit is usually an accidental extra
path for current to flow.
Series vs Parallel CircuitsParallel Circuits
• Current can take more than one path
• If multiple bulbs are in circuit, if one goes out, the others will __________
• Homes are wired with ________ circuits
Series Circuits Current can only take
one ______ If multiple bulbs in
circuit, if one goes out they all go out
Series circuits would not work in the home because all electrical items would have to be on all the time to keep the circuit closed
Equivalent Resistance – Series Circuit• For a series circuit you
just ___ the resistance of each resistor to find the _____ ________
Equivalent Resistance - Parallel Circuit• To find the resistance in
a parallel circuit you add the _______ of each resistance