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Circ. & Mech. FINAL
| Question | Answer |
|---|---|
| What is an AC current | Current that changes over time |
| What is a DC current | Current that is constant over time |
| What is voltage? | Push of elections through a circuit |
| What is power | Time rate of change (delivered or absorbed) |
| What are the types of things in a circuit | Active (generate power: voltage/current sources) and passive (can't generate power: resistors, capacitors, inductors) |
| If power is absorbed, what is the sign? | Positive |
| If power is generated, what is the sign? | Negative |
| What is a branch? | Single element (voltage source, resistor, etc) |
| What is a node? | Connection/wire between branches |
| How to calculate a loop? | l = b - n + 1 |
| What is KCL? | Applied at nodes to find unknown currents - Sum currents entering = sum currents leaving (assume a sign direction) |
| What is KVL? | Applied around loops to find unknown voltages - Sum voltages around a loop = 0 |
| What is nodal analysis? | Select a reference node, Identify all KNOWN node voltages, Apply KCL at each node, replace currents in terms of VOLTAGES, solve for unknowns |
| What is mesh analysis? | Determine # needed mesh, assign mesh currents, identify known currents, write KVL equations, replace voltages in terms of CURRENTS, solve for mesh's, solve for unknowns |
| What happens to resistance in a short circuit? | R = 0 |
| What happens to resistance in an open circuit? | R = infinity (treat it as no current at all) |
| What is the point of thevenin and nortons theorems? | To simplify complicated circuits |
| How do you disable a current source? | Open it (open wire, remove source) |
| How do you disable a voltage source? | Short it (draw wire through source) |
| What is a thevenin equivalent? | Voltage source in series with a resistor |
| What is a norton equivalent | Current source in parallel with a resistor |
| Steps for thevenins equivalent | find and isolate terminals where thevenin equivalent is wanted, eliminate all but one source in the circuit, find Rth, reactivate sources and find Voc = Vth, put T.E to OG circuit and find perform desired analysis |
| Steps for nortons equivalent | find and isolate terminals where norton equivalent is wanted, eliminate all but one source, determine Rth, reactivate sources, short-circuit output terminals and find Isc, put N.E into OG circuit to perform desired analysis |
| What can a voltage source in series with a resistor become? | A current source in parallel with a resistor |
| What can a current source in parallel with a resistor become? | A voltage source in series with a resistor |
| What is important to remember for source transformation? | Don't touch element of the value you're looking for |
| What is source transformation? | Temp. turn off other sources except for ONE, analyze resulting circuit to get the value of that source, repeat for each source, sum all sources (if same element) |
Created by:
user-2008861