# physics ch 18 - 1 302L Ch.19 GENERAL PHYSICS PHY 302L DC...

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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 Kirchhoff¡s Rules RC Circuits Household Circuits Electrical Safety 302L : Ch.19 Electromotive Force Direct current • ' V at battery terminals is constant Æ current is constant in magnitude and direction Æ direct current (DC) • Battery Æ source of electromotive force ( emf ) The emf H of a battery Æ maximum possible voltage that the battery can provide between its terminals 302L : Ch.19 Electromotive Force Internal resistance • Battery is made of matter Æ there is resistance to the flow of charge within the battery Æ internal resistance r • Terminal voltage Æ potential difference across battery • For a real battery Æ terminal voltage is not equal to battery’s emf • emf H Æ open-circuit voltage • Terminal voltage ' V Æ 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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physics ch 18 - 1 302L Ch.19 GENERAL PHYSICS PHY 302L DC...

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