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Electronic Principles
Ch. 1 - Introduction
20
Electrical Engineering
Undergraduate 1
01/10/2011

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Term
Cold-Solder Joint
Definition
A poor solder connection resulting from insufficient heat applied during the soldering process. The cold-solder joint may act as an intermittent connection or as no connection at all.
Term
Definition
Definition
A formula invented for a new concept based on scientific observation.
Term
Derivation
Definition
A formula produced with mathematics from other formulas.
Term
Duality Principle
Definition
For any theorem in electrical circuit analysis, there is a dual (opposite) theorem in which one replaces the original quantities with dual quantities. This principle can be applied to Thevenin's and Norton's theorems.
Term
Formula
Definition
A rule that relates quantities. The rule may be an equation,, equality, or other mathematical description.
Term
Ideal (first) Approximation
Definition
The simplest equivalent circuit of a device. It includes only a few basic features of the device and ignores many other of less importance.
Term
Law
Definition
A summary of a relationship that exists in nature and can be verified with an experiment.
Term
Norton Current
Definition
The load current when the load resistor is shorted. Derived from the duality principle, the Norton theorem states that the load voltage equals the Norton current times the Norton resistance in parallel with the load resistance. I_N= I_SC
Term
Formula for Norton Current
Definition
I_N= I_SC
Term
Norton Resistance
Definition
Is the resistance that an ohmmeter measures across load terminals when all sources are reduced to zero and the load resistor is open. R_N= R_OC
Term
Formula for Norton Resistance.
Definition
R_N= R_OC
Term
Open Device
Definition
A device that has infinite resistance resulting in zero current flow through it.
Term
Second Approximation
Definition
An approximation that adds a few more features to the ideal approximation. For a diode or transistor, this approximation includes the barrier potential in the model of the device. For silicon diodes or transistors, this means 0.7 V is included in the analysis.
Term
Shorted Device
Definition
A device that has zero Ohm's of resistance resulting in zero voltage dropped across it.
Term
Solder Bridge
Definition
An undesirable splash of solder connecting two conducting lines or circuit paths.
Term
Theorem
Definition
A derivation, in a statement form, that can be proved mathematically.
Term
Thevenin Resistance
Definition
A fundamental theorem that says any circuit driving a load can be converted to a single generator and series resistance. R_TH = R_OC
Term
Thevenin Voltage
Definition
The voltage across the load terminals when the load resistor is open. Because of this, the Thevenin voltage is sometimes called the open-circuit voltage. V_TH= V_OC
Term
Third Approximation
Definition
An accurate approximation of a diode or transistor. Used for designs that need to take into account as many details as possible.
Term
Troubleshooting
Definition
A method of determining a circuit fault using an acquired knowledge of electronics theory and electronics measurement equipment.
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