lec07_ddn2x2

# lec07_ddn2x2 - How much current will flow in a circuit...

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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: Kirchhoff’s Rules 9/13/11 3 Kirchhoff’s Rules 2. Kirchhoff’s Junction Rule: 0 = ! I This is the consequence of conservation of charge: (charge cannot be created or destroyed). 1.Kirchhoff’s Loop Rule: 0 = ! " V Change in PE of a charge as it travels around a complete circuit loop must be zero 9/13/11 4 Kirchhoff’s First Rule (“Loop Rule” or “Kirchhoff’s 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 2

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## This note was uploaded on 12/07/2011 for the course PHYS 221 taught by Professor Pyrak-nolte,laura during the Fall '08 term at Purdue.

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lec07_ddn2x2 - How much current will flow in a circuit...

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