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  • 1. Circuits
  • 2. Circuits • Closed circuit – switch closed, electricity flows
  • 3. Open Circuit – switch open, no electricity flows
  • 4. Circuit Diagram • Circuit diagrams - shortcuts to drawing a circuit • Circuits are made up of different parts – wires, switches, batteries, & resistors
  • 5. Common Circuit Symbols • Wire • Battery • Light bulb • Resistor
  • 6. Types of Circuits • Series Circuits – has only one path – Current is the same everywhere – Voltage decreases as it passes through resistors – If any part circuit is broken, the circuit fails – Ex) Older Christmas lights: if one bulb doesn’t work, the entire strand doesn’t work.
  • 7. • Parallel Circuits – has multiple paths for flow – The branches are all independent: If one fails, the rest of them still work – Voltage and current same across branches – Ex ) Home or school - If one thing stops working, everything else still works
  • 8. Short Circuit • A short circuit is a wire that bypasses a device in a circuit • Electricity always chooses the path of least resistance • Wires have virtually no resistance, so it will go through a wire rather than a device
  • 9. • Short circuiting a battery cause two problems: – Battery gets drained faster – Wire will heat up, possibly melting the insulation, which could start a fire