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19 Cards in this Set
- Front
- Back
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KCL
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Sum of Currents at a Node must Equal Zero
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KVL
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Sum of Voltages in a Loop must Equal zero
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Ohm’s Law
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V=IR
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Resistance Laws(Series)
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Req = R1+R2+R3...+Rn
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Resistance Laws(Parallel)
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Req = 1/((1/r1)+(1/r2)+.....(1/rn))
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Voltage Devider
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Vn = (Rn/(R1+R2+...Rn))*Vs
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Current Divider
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in = ((1/rn)/((1/r1)+(1/r2)+....(1/rn)))*is
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P(watt) =
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V*I, = I^2*R = V^2/R
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Current through a series Curcuit
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current through one element must equal the current in the next
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Voltage through a Parallel Curcuit
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Voltage Through each element equals the other
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Node Analysis
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1. Select 1 node to be the reference
2. Mark the other nodes and label node voltages. 3. Mark the current direction & Polarity on R’s based on PSC, 4. Decide if any node voltages are known, 5. write a kcl equation for each node with an unknown voltage, 6. Express the currents in terms of node voltages i1-i2 = 0 (v1-v2/r1), 7. Gather Node Voltages together, 8. Solve for Node voltages. 9. Use node voltages to solve for other voltages/currents. |
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When are Node voltages known?
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When a Voltage source is connected to a refference node.
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Mech Analysis
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1. Mark Meshes & Lable mesh currents(will do clockwise in class), 2. Decide which mesh currents are known/unknown, 3. Write a KVL Equation for eash mesh with an unknown mesh current *assign Polarity on resistors based on mesh current of KVL Eqn. 4. Express Voltages in terms of Mesh Currents, 5. Gather up all of terms and solve,
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When is a Mesh current known?
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When a current supply is connected to only one mesh.(if it isn’t then both of the meshes are dependent.
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Equivalent resistance
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1. Remove the load resistor,
2. Clealy mark Terminal where the resistor was 3. zero all independent sources 4. "zero" means a wire over voltage sources and make current sources open 5.Find the equivalent Resistance between load terminals (This is Rn &Rt) *tips - redraw circuits if your having issues condensing |
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Thevenin Circuit
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Nortan Cicuit
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Computing the norton Current
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1. Replace the load with a short circuit
2. Define the short-circuit current i(sc) to be the Norton equivalent current 3. Apply any preferred method (e.g., node analysis) to solce for i(sc) 4. The Norton current is i(n) = i(sc) |
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Computing the Thevenin Voltage
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1. Remove the load, leaving the load terminals open-circuited.
2. Define the open-circuit voltage v(oc) accross the open load terminals. 3. Apply any preferred method (e.g, node analysis) to solve for v(oc). 4. The Thevenin voltage is v(t) = v(oc) |
