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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 three-digit 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 cross-sectional 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.
Series-connected batteries
the positive electrode of one cell is connected to the negative electrode of the next and so on.
Parallel-connected 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 two-digit result by 0.1
XY x 0.1 = X.Y
Third band special multiplier: silver
Multiply the first two-digit 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 cross-sectional area used for wires
CM
1CM
wire with diameter of .001 inch