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# lec07_ddn - How much current will flow in a circuit Analogy...

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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 Δ V defines amount of the current that flows in a circuit

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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 = Δ V Change in PE of a charge as it travels around a complete circuit loop must be zero

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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: ε 1 R 1 R 2 I ε 2
9/13/11 5 Rules ε 1 R 1 R 2 I ε 2 Voltage Gains enter with a + sign .

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lec07_ddn - How much current will flow in a circuit Analogy...

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