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EE 302 - Review - Final Exam Review

EE 302 - Review - Final Exam Review - the direction of the...

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Final Exam Review – Part 2 Dr. Telang
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Passive Power Convention P = VI (current enters at positive terminal) P = -VI (current enters at negative terminal) If power is negative – delivering If power is positive – absorbing Always have conservation of power
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Ohm’s Law V = IR (when current enters positive terminal) V = -IR (when current enters negative terminal)
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KCL Conservation of Charge Equation Algebraic sum of currents entering a node is zero.
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KVL Conservation of energy equation Algebraic sum of voltages around a loop is zero.
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Node-Voltage or Nodal Analysis Assign branch currents (with current names I1, I2 … and a direction to every branch). Identify the essential nodes. Denote one node as reference. Write KCL for every other essential node. If a voltage source is present between 2 essential nodes, use supernode.
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Mesh-Current Identify the meshes. Define the polarity of voltages across all resistors. Polarity should be assigned in
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Unformatted text preview: the direction of the mesh current. • Write KVL for every mesh. • Use supermesh method if current source is present in branch between 2 meshes. Superposition • Determine the effect of each independent source taken one at a time. • Deactivate the other sources – short voltage sources, open current sources . Thevenin and Norton • Identify load resistor and remove it. • First find Vth – same as Voc. Use any method. • Then find Rth: when dependent sources are present use the test voltage method. Always deactivate all independent sources. Note: Circuits for Vth and Rth calculation are different. Maximum Power Transfer • First find V th , R th (after removing the load) • When R L = R th , there is maximum power transfer. Operational Amplifiers 2 rules of Op-Amps: 1. Current entering the op-amp inputs = 0 2. V + = V-(Input voltage at the inverting and non-inverting inputs are equal)...
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