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Electrical Circuits

Electrical Circuits. Electrical Circuit. Closed path through which charge can flow A Circuit needs: Source of energy (voltage) Conductive path for charge to flow Source of resistance (device to do work). Batteries. Provide the energy (voltage) for charge to flow in a circuit

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Electrical Circuits

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  1. Electrical Circuits

  2. Electrical Circuit • Closed path through which charge can flow • A Circuit needs: • Source of energy (voltage) • Conductive path for charge to flow • Source of resistance (device to do work)

  3. Batteries • Provide the energy (voltage) for charge to flow in a circuit • Have (+) and (-) terminals

  4. Dry cell • Series of chemical reactions causes electrons to flow and accumulate at the (-) terminal • Used in portable electronics + terminal - terminal

  5. Wet Cell • Has 2 connected metal plates submerged in an electrolyte: solution that conducts electricity • Ex: Car battery

  6. Circuit Diagrams • Use symbols to represent parts of a circuit • Shows one or more complete paths that charge can flow

  7. Current flow Battery + - Current always flows from positive (+) to negative (-) battery terminal

  8. Series Circuits • Charge has only one path to flow • If one device stops working they all stop working! • Viewing series circuit

  9. Series Circuits • Adding light bulbs to a series circuit increases resistance • CURRENT DECREASES, BULBS BECOME DIMMER

  10. Parallel Circuits • Circuit with two or more paths for current to flow • If one device stops working the rest continue to work!

  11. Parallel Circuits • Viewing Parallel Circuit • Homes and buildings are wired in parallel • Bulbs shine brighter in parallel than series • All Directly connected to battery

  12. Parallel circuits • Current in branch depends on resistance • More current flows through the path of lowest resistance • Voltage is same across each branch

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