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Unformatted text preview: 9/13/11 1 How much current will flow in a circuit? Want to predict I Analogy: If water height difference (potential energy) is maintained, the flow rate of water will not change The flow rate of water will depend on the water height difference Potential difference V defines amount of the current that flows in a circuit 9/13/11 2 Predicting Current in Circuits How could one predict currents running in a complicated circuit? Answer: Kirchhoffs Rules 9/13/11 3 Kirchhoffs Rules 2. Kirchhoffs Junction Rule: = I This is the consequence of conservation of charge: (charge cannot be created or destroyed). 1.Kirchhoffs Loop Rule: = V Change in PE of a charge as it travels around a complete circuit loop must be zero 9/13/11 4 Kirchhoffs First Rule (Loop Rule or Kirchhoffs Voltage Law) The algebraic sum of the changes in potential encountered in a complete traversal of any loop of circuit must be zero. Move around circuit: 1 R 1 R 2 I 2 9/13/11 5 Rules 1 R 1 R 2 I 2 Voltage Gains enter with a + sign . Voltage Drops enter with a...
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This note was uploaded on 12/04/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue UniversityWest Lafayette.
 Spring '09
 CHANG
 Physics, Current, Energy

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