1. Types Circuit Diagrams
Circuits
Types
Circuit Diagrams

2. Recall A circuit is a closed path of conducting material
Electricity cannot flow unless a circuit is present
A circuit includes
Power source
Conducting wires
Load

3. Types of Circuits
Series circuit
Parallel circuit

4. Series Circuit One path
If one device burns out, circuit is incomplete and does not work
Current is the same everywhere
Example: old Christmas lights

5. Parallel Circuit More than one path
If one device goes out, the rest are unaffected
Current is the sum of the currents from all paths
Example: the plugs in your home

6. Circuit Diagrams
Use symbols to represent circuit arrangement

7. Circuit Diagram Examples

8. Circuit Diagram Examples

9. Rules for Drawing Circuit Diagrams
Use a PENCIL
Use a RULER to draw CONDUCTING WIRES
Wires are always PERPENDICULAR and PARALLEL
Loads appear in the same order in the circuit diagram as stated in a question
Switches are ON if the current is flowing
Mark the positive and negative ends of the
Cell
Battery
Voltmeter
Ammeter
Indicate the direction of flow of current with an arrow and the symbol e-

10. Circuit Symbols Name Diagram Conducting wire Wires joined
Wires not joined
Cell
Battery with 3 cells
Lamp
Resistor

11. Circuit Symbols Name Diagram Ground connector Switch Motor Fuse
Voltmeter
Ammeter

12. Example 1
Circuit
Circuit Diagram

13. Example 2
Circuit
Circuit Diagram

14. Example 3 Circuit Circuit Diagram
Draw a circuit with a two cell battery, two lamps and a switch, all connected in series.

15. Example 4 Circuit Circuit Diagram
Draw a circuit that contains a two cell battery, three lamps in parallel and a switch that controls the whole circuit.