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Aim: How can we explain electric current and resistance

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Aim: How can we explain electric current and resistance

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    1. Aim: How can we explain electric current and resistance?

    2. Electron Flow Current flows from negative to positive

    3. Electric Current The “flow of charge” – the amount of charge that passes a single point in a period of time

    5. A current of 2.0 A is flowing in a circuit. How much charge passes a given point in the circuit in 30 seconds? I = ?q t 2.0 A = ?q 30 s (2.0 A)(30 s) = ?q 60 C = ?q

    7. Resistance A measure of how easy or difficult it is for current to flow

    8. Ohm’s Law

    13. Graph of V vs. I

    14. Resistance Increases when: Length of conductor increases/decreases Cross sectional area of conductor increases/decreases Temperature of metal conductor increases Temperature of non-metal conductor decreases

    15. Resistance of Conducting Wire R = Resistance (O) ? = Resistivity (O•m) L = Length (m) A = Cross Sectional Area (m2)

    16. Resistivity

    17. Calculate the resistance of a 2.0-m long Aluminum wire with a cross sectional area of 1.5 x 10-3 m2. R = ?L A R = (2.82 x 10-8 O•m)(2.0 m) (1.5 x 10-3 m2) R = 3.8 x 10-5 O

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