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Ch. 21 - Electricity

Ch. 21 - Electricity. III. Electrical Circuits (p.608-613) Circuit components Series circuits Parallel circuits Household circuits. A. Circuit Components. A - battery C - light bulb B - switch D - resistor. B. Series Circuits. Series Circuit current travels in a single path

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Ch. 21 - Electricity

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  1. Ch. 21 - Electricity III. Electrical Circuits (p.608-613) 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

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