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49 Cards in this Set
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Engineering Notation

A system for representing any number as a one, two, or threedigit number times a power of ten with an exponent that is a multiple of 3


SI

Standardized internationalized system of units used for all engineering and scientific work.


SI fundamental units and symbols
(7) which necessary for this class 
Length Meter m
Mass kilogram kg Time second s Electric current Ampere A Temp Kelvin K Luminous intensity Candela cd Amount of substance Mole mol 

SI supplemental units and symbols
(2) 
Plane angle Radian r
Solid angle Steradian sr 

Electrical quantities w/ derived units and symbols
(7 for this class) bonus: name top 3 
Charge Q Coulomb C
Conductance G Siemens S Energy W Joule J Frequency f Hertz Hz Power P Watt W Resistance R Ohm Ω Voltage V Volt V 

Metric Prefixes w/ symbol, power of ten
(9) 
femto f 15
pico p 12 nano n 9 micro u(ish) 6 milli m 3 kilo k 3 mega M 6 giga G 9 tera T 12 

femto
(symbol and power/place) 
f 15
nano pico femto (+ to ) femto pico nano ( to +) 

pico
(symbol and power/place) 
p 12
micro nano pico femto (+ to ) femto pico nano micro ( to +) 

nano
(symbol and power/place) 
n 9
micro nano pico (+ to ) pico nano micro ( to +) 

micro
(symbol and power/place) 
u(ish) 6
milli micro nano (+ to ) nano micro milli ( to +) 

milli
(symbol and power/place) 
m 3
kilo ___ milli micro (+ to ) nano micro milli ( to +) 

kilo
(symbol and power/place) 
k 3
mega kilo ____ (+ to ) milli ____ kilo ( to +) 

mega
(symbol and power/place) 
M 6
giga mega kilo (+ to ) ____ kilo mega ( to +) 

giga
(symbol and power/place) 
G 9
tera giga mega (+ to ) kilo mega giga ( to +) 

tera
(symbol and power/place) 
T 12
tera giga mega ( to +) kilo mega giga..(+ to ) 

Valence shell

The outermost shell of an atom. Electrons in this shell are the valence electrons.


Free electron

An electron that has absorbed a photon with sufficient energy to escape from the atom.


Ion

When an atom or group of atoms is left with a net charge.


Coulomb

The unit of charge. Electrical charge (Q) measured in coulombs, symbolized by C. 6.25 X 10 (18th).


Voltage

The difference in potential energy per charge is the potential difference.


Current

The movement of electrons.


Ampere

(A) the amount of current that exists when a number of electrons having a total charge of one coulomb (1C) move through a given crosssectional area in on second.


Resistance

The opposition to current. Expressed in ohms (Ω)


Semiconductors have x elctrons in their valence shell.

4 electons in valence shell.


Seriesconnected batteries

the positive electrode of one cell is connected to the negative electrode of the next and so on.


Parallelconnected battery

the positive electrodes of several cells are connected together and all the negative electodes are conncected together. Increases battery capacity.


A generator converts...

...mechanical energy into electrical energy using electromagnetic induction.


A motor converts...

...electrical energy into mechanical energy.


Three things necessary to make a generator, alternator, or a motor work.

Wire
Magnetic Field Motion 

Resistor size does not...

...determine resistance value, only how much heat it can get rid of.


Decode a 4 band resistor

1st  first digit
2nd  second digit 3rd  number of zeros 4th  percent tolerance 

Resistor color codes 0  4

black
brown red orange yellow 

Resistor color codes 5  9

green
blue violet gray white 

Resistor tolerance colors and values

gold  plus or minus 5%
silver  plus or minus 10% 

Third band special multiplier: gold

multiply the first twodigit result by 0.1
XY x 0.1 = X.Y 

Third band special multiplier: silver

Multiply the first twodigit result by 0.01.
XY x .01 = .XY 

continued

chapter 2


Voltage =

W/Q energy divided by charge(where W is expressed by joules)


I (current)

Q/t current equals charge divided by time


G (conductance)

1/R Conductance is reciprocal of resistance


Thermistor

Type of variable resistor that is temperature sensitive


Negative thermistor

resistance chrge inversely with temperature change


Positive thermistor

resistance change directly with temperature change


Load

an element connected across the output terminals of a circuit that draws current from the source and upon which work is done


SPST

single post single throw switch


DPDT

double post double throw


AWG

American Wire Gauge


Circular mil

a unit of crosssectional area used for wires
CM 

1CM

wire with diameter of .001 inch
