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Definition
| A one port is a network that can consist of many sources and resistors but which has only two external terminals |
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| What is an 'active' network? |
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Definition
| Active means that there is at least one voltage or current source in the network. |
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| What is a 'linear network'? |
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Definition
| Linear means that there are only components with linear characteristic in the network like resistors and DC Voltage sources etc. |
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| How do you determine open circuit voltage for use in a Thevenin equivalent circuit? |
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Definition
| The voltage of the ideal voltage source is equal to the open circuit voltage of the one-port. The load resistance is removed and determined by network analysis of the voltage at the terminals. |
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| How do you determine short circuit current for use in a Norton equivalent circuit? |
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Definition
| Replace the load resistance with a short circuit and determine the current passing through to find the short circuit current. |
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| How do you determine the internal resistance for use in a Norton or Thevenin equivalent circuit? |
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Definition
The internal resistance between the terminals can be determined by applying Kirchhoffs' laws and the rules for series and parallel connection of resistors. Therefore,
- ideal voltage sources are replaced by a short circuit
- ideal current sources are removed
Calculate the total resistance of the remaining circuit with respect to the terminals under investigation. |
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Definition
| An electrical load is an electrical component or portion of a circuit that consumes electric power. This is opposed to a power source, such as a battery or generator, which produces power. |
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How do you convert a 'Y' network of resistors R1, R2, and R3 to a 'Δ' network with resistors RA, RB, and RC?
[image] |
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Definition
[image] = [image]
[image] = [image]
[image] = [image]
Pay attention to the node numbers in the diagram |
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| How do you convert a 'Δ' network of resistors RA, RB, and RC to a 'Y' network with resistors R1, R2, and R3?[image] |
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Definition
[image]
[image]
[image]
Pay attention to the node numbers in the diagram! |
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| What is the voltage divider rule? |
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Definition
x = Some element in the circuit
U = total voltage in the circuit
R = total resistance
For a series circuit only
[image] |
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| What is the current divider rule? |
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Definition
x = some circuit element
I = total current in the circuit
G = total conductance (1/R)
For a parallel circuit only
[image] |
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| What is Kirchhoff's voltage law? |
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Definition
| The algebraic sum of the potential rises and drops around a mesh is zero. |
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Term
| What is Kirchhoff's current law? |
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Definition
| The algebraic sum of the current flowing in and out of a node is zero. |
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Term
| What is the formula for the combined resistance of two resistors in parallel? |
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Definition
[image]
(Does not work with more than two resistors) |
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| What is the formula for the combined resistance of any number of resistors in parallel? |
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Definition
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Term
| What is the superposition principle? |
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Definition
| The principle states that in a linear network the effect of all sources can be determined at any point in the network as sum of the effects of each source. Therefore, all ideal sources are to be replaced by its ideal internal resistances (ideal voltage source with Ri=0, ideal current source with Ri = ∞). |
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| What is the procedure for using the superposition principle? |
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Definition
Procedure:
1. For the effect of each source a separate circuit diagram is drawn where all other voltage sources are replaced by a short circuit and all current sources are removed.
2. For each circuit diagram the partial current and partial voltage generated by the single source is determined.
3. All partial currents and voltages are added to obtain the voltage and current generated by all sources. |
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| For a linear voltage source with U0 and Ri or any other linear 2 terminal network that has been transformed into the equivalent voltage source by the superposition principle (a Norton or Thevenin circuit) the power dissipation in the load RL is________? |
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Definition
[image] = Power at load
[image] = Voltage from source
[image] = Internal resistance
[image] |
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Term
| In a load resistance [image] supplied by a linear voltage source the maximum power is dissipated in the load if the value of the load resistance is ______? |
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Definition
| Maximum power is obtained when [image] |
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Term
For capacitors:
i(t) = ??? |
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Definition
[image]
Current as a function of time equals capacitance times the derivative of voltage with respect to time. |
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Term
For capacitors:
u(t) = ??? |
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Definition
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Definition
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Term
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Definition
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Term
| What is the formula for calculating capacitance of capacitors in series? |
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Definition
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Term
| What is the formula for calculating capacitance of capacitors in parallel? |
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Definition
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Term
| What is the formula for the inductance of inductors in series? |
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Definition
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Term
| What is the formula for the inductance of inductors in parallel? |
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Definition
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Term
| What is the formula for energy stored in a capacitor? |
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Definition
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Term
| What is the formula for energy stored in an inductor? |
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Definition
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Term
What do 'A', omega, and phi mean in the following formula?
[image] |
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Definition
A: amplitude (or peak amplitude)
Omeg: angular frequency = 2πf = 2π/T(radians per sec) (controls how many cycles/second)
Phi: phase (radians) (Shifts the wave left or right |
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Term
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Definition
[image]
A phasor is a way of representing sinusoidal values as complex numbers. It is here shown in polar form. 'A' is the amplitude of the sinusoidal wave, and phi is the phase shift. The underlined 'U' represents u(t), but it is not equal to u(t). |
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| What is the RMS value of sinusoidal current? |
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Definition
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Term
| What is the RMS value of sinusoidal voltage? |
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Definition
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Term
What are the formula to:
1. Convert sin to negative sin?
2. Convert cos to negative cos?
3. Convert sin to cos?
4. Convert cos to sin? |
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Definition
[image]
[image]
[image]
[image] |
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Term
| What are the important properties of a capacitor? |
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Definition
1. A capacitor is an open circuit to DC
2. When connected to DC, a capacitor will charge.
3. The voltage across a capacitor can not change instantaneously
4. The current across a capacitor can change instantaneously
5. A capacitor does not dissipate energy, rather it takes power from the circuit when absorbing energy in its magnetic field and returns energy when delivering power. |
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