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Unformatted text preview: 1 Lecture 15 Chapter 19. Electric Circuits Announcement: There will be no lectures on Monday March 28 and Wednesday March 30, 2011 to compensate for the evening exam #1 that took place on Feb 15th, 2011 and evening exam #2 that will take place on March 30 st , 2010. i 1 = i 2 i 2 = i 3 + i 4 Current at a Node Current Node Rule or Junction Rule or “Kirchhoff’s Current Law” Energy in a Circuit Energy conservation (the Kirchhoff loop rule [2 nd law]): V 1 + V 2 + V 3 + … = 0 along any closed path in a circuit V wire = EL V battery = ? V= U/q energy per unit charge Energy Conservation The algebraic sum of the changes in potential encountered in a complete traversal of any loop of circuit must be zero. “Loop Rule” or Junction Rule or “Kirchhoff’s Voltage Law” Δ V 1 + Δ V 2 + Δ V 3 + .... = along any closed path in a circuit. Δ V = Δ U q Energy per unit charge 2 E C F C The emf is measured in Volts, but it is not a potential difference!...
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 Spring '07
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 Electron, Current, Volt, Electric charge, Incandescent light bulb, Kirchhoff's circuit laws

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