Circuits pres
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Circuits pres Presentation Transcript

  • 1. Ch. 17 - Electricity
    • III. Electrical Circuits
      • Circuit components
      • Series circuits
      • Parallel circuits
      • Household circuits
  • 2. A. Circuit Components
    • A - battery C - light bulb
    • B - switch D - resistor
  • 3. B. Series Circuits
    • Series Circuit
      • current travels in a single path
        • one break stops the flow of current
      • current is the same throughout circuit
        • lights are equal brightness
      • each device receives a fraction of the total voltage
        • get dimmer as lights are added
  • 4. C. Parallel Circuits
    • Parallel Circuits
      • current travels in multiple paths
        • one break doesn’t stop flow
      • current varies in different branches
        • takes path of least resistance
        • “ bigger” light would be dimmer
      • each device receives the total voltage
        • no change when lights are added
  • 5. D. Household Circuits
    • Combination of parallel circuits
      • too many devices can cause wires to overheat
    • Safety Features:
      • fuse - metal melts, breaking circuit
      • circuit breaker - bimetallic strip bends when hot, breaking circuit