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Basic Electricity
A card set for section one of "Understanding of Basic Electronics" section 1
20
Other
Undergraduate 1
10/19/2008

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Term
 Electron Flow
Definition
movement of electrons (always from more negative to more positive)
[represented in this class by "e
®"]
Term
Current Flow
Definition
opposite of direction of electron flow (exactly the same in every other respect)
[represented in this class by "I
®"]
Term
Current:
Definition
1 Amp of current means that 6.25 X 1018 electrons have moved past a point in one second
Term
mA or milliampere:
Definition
 .001A is used more commonly than Amp, because an Amp is a very large amount of current
Term
Voltage:
Definition
Term used to designate electrical pressure or force that causes current to flow. Also known as "potential."
Term
Voltage Drop:
Definition
The difference in voltage from one end of an electrical component or circuit to the other. Also called "voltage across". It is the amount of voltage "used up" by the component. When measuring, the two ends of the Voltmeter should be connected to either end of the component.
Term
Voltage (at a point):
Definition
The difference in voltage between the given point and Ground (GND). When measuring the red lead of the voltmeter should be connected to the point and the black lead to Ground.
Term
Conductor:
Definition
a material that allows electrical current to flow through it
(copper and most metals are good conductors, so are you)
Term
Insulator:
Definition
a material that does not allow an electrical current to flow through it (plastic and air are both insulators)
Term
D.C. (direct current):
Definition
electron flow that moves in only one direction
Term
A.C. (alternating current):
Definition
electron flow that alternates between moving in one direction and then the other
Term
Sine Wave:
[image]
Definition
Most common form of A.C. A geometric waveform that oscillates periodically, and is defined by the function y = sin x. In other words, it is an s-shaped, smooth wave that oscillates above and below zero
Term
VPK
Definition
A way of describing an AC voltage. Simply the voltage at the highest point of the wave.
Term
VPK-PK
Definition
A way of describing an AC voltage. The difference between the most positive point of the wave and the most negative point of the wae. In a sine wave, twice the VPK.
Term
VRMS
Definition

The most common way to describe an AC voltage. Relates the AC voltage to what a comparable DC voltage would be

Vrms=0.707(Vpk)
Vpk=1.414(Vrms)

Term
Period
Definition
 Period is the time it takes for a single cycle of an AC wave to complete
Term
Frequency
Definition
Frequency is given in Hertz (Hz) which is the number of cylces that are completed per second.
Frequency = 1/period(
given in seconds)
Term
Wavelength
Definition
The physical length of the AC wave.
wavelength= Speed/Frequency (speed of sound is 1128 feet per second)
Term
ELECTRONS ALWAYS
Definition
electrons ALWAYS move from more negative to more positive
Term
It is possible to:
Definition
...have voltage without current, but not possible to have current without voltage
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