01 KVL rev F09 - EECS 314 Kirchhoff's Voltage Law We...

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EECS 314 // Kirchhoff's Voltage Law 9/1/10 © 2010 A. Ganago 1 We continue discussion of basic laws applicable to all circuits Again, it still does not matter what exactly the circuit elements are; but pay attention to their connections © 2010 A. Ganago 1 KVL rev F09 © 2010 A. Ganago 2 Gustav Kirchhoff (1824-1887) formulated Basic Circuit Laws in 1847: Kirchhoff’s Current Law (KCL) Kirchhoff’s Voltage Law (KVL) We already discussed KCL Today, we start working with KVL KVL rev F09 © 2010 A. Ganago 3 Basic facts about voltage (1) • Electric voltage V AB is the difference of electric potentials between points A and B • Around any closed path (where A is the beginning and B is the end) the sum of electric voltages equals zero KVL rev F09 © 2010 A. Ganago 4 Basic facts about voltage (2) • Electric voltage V AB is work on a unit charge in order to move it from point A to point B • Units: • Around any closed path, work is zero KVL rev F09 1 Volt = 1 Joule 1 Coulomb Kirchhoff’s Voltage Law (KVL) • The sum of electric potentials around any closed path equals zero • Consequence of the universal law of Conservation Of Energy © 2010 A. Ganago KVL rev F09 5 In other words, KVL means: • The sum of voltage rises around any closed path equals the sum of voltage drops • Energy is conserved in any part of our Universe, including every electric circuit © 2010 A. Ganago KVL rev F09 6
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EECS 314 // Kirchhoff's Voltage Law 9/1/10 © 2010 A. Ganago 2 © 2010 A. Ganago 7 • We must define the two points, between which we
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