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Transcript
Circuits Types Circuit Diagrams Recall • A circuit is a closed path of conducting material • Electricity cannot flow unless a circuit is present • A circuit includes 1. Power source 2. Conducting wires 3. Load Types of Circuits • Series circuit • Parallel circuit 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 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 Circuit Diagrams • Use symbols to represent circuit arrangement Circuit Diagram Examples Circuit Diagram Examples Rules for Drawing Circuit Diagrams 1. 2. 3. 4. 5. 6. 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 – – – – 7. Cell Battery Voltmeter Ammeter Indicate the direction of flow of current with an arrow and the symbol e- Circuit Symbols Name Conducting wire Wires joined Wires not joined Cell Battery with 3 cells Lamp Resistor Diagram Circuit Symbols Name Ground connector Switch Motor Fuse Voltmeter Ammeter Diagram Example 1 Circuit Circuit Diagram Example 2 Circuit Circuit Diagram Example 3 Circuit Draw a circuit with a two cell battery, two lamps and a switch, all connected in series. Circuit Diagram Example 4 Circuit Draw a circuit that contains a two cell battery, three lamps in parallel and a switch that controls the whole circuit. Circuit Diagram