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Ch 25 Current, Resistance, and Electromotive Force © 2005 Pearson Education

25.1 Current © 2005 Pearson Education

Same number of charge

general expression for current vector current density © 2005 Pearson Education

25.2 Resistivity definition of resistivity © 2005 Pearson Education

temperature dependence of resistivity © 2005 Pearson Education

25.3 Resistance © 2005 Pearson Education

25.4 Electromotive Force and Circuits © 2005 Pearson Education

Potential rises and drops in a circuit

25.5 Energy and Power in Electric Circuits © 2005 Pearson Education

25.6 Theory of Metallic Conduction © 2005 Pearson Education

Resistivity Current density

Example Calculate the mean free time between collisions in copper at room temperature. Calculate the mean free time between collisions in copper at room temperature. ANS: ANS: © 2005 Pearson Education

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