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# Circuits pres

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### Circuits pres

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