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Unformatted text preview: 1 302L : Ch.19 GENERAL PHYSICS PHY 302L DC Circuits Maxim Tsoi Physics Department, The University of Texas at Austin http://www.ph.utexas.edu/~tsoi 302L : Ch.19 DC Circuits Chapter Outline Sources of Electromotive Force Kirchhoffs Rules RC Circuits Household Circuits Electrical Safety 302L : Ch.19 Electromotive Force Direct current ' V at battery terminals is constant current is constant in magnitude and direction direct current (DC) Battery source of electromotive force ( emf ) The emf H of a battery maximum possible voltage that the battery can provide between its terminals 302L : Ch.19 Electromotive Force Internal resistance Battery is made of matter there is resistance to the flow of charge within the battery internal resistance r Terminal voltage potential difference across battery For a real battery terminal voltage is not equal to batterys emf emf H open-circuit voltage Terminal voltage ' V potential difference across load resistance Ir V ' H 302L : Ch.19 Electromotive Force Internal resistance Current depends on both the load resistance and the internal resistance...
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