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49 Cards in this Set
- Front
- Back
Engineering Notation
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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
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SI
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Standardized internationalized system of units used for all engineering and scientific work.
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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 |
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SI supplemental units and symbols
(2) |
Plane angle Radian r
Solid angle Steradian sr |
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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 |
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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 |
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femto
(symbol and power/place) |
f -15
nano pico femto (+ to -) femto pico nano (- to +) |
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pico
(symbol and power/place) |
p -12
micro nano pico femto (+ to -) femto pico nano micro (- to +) |
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nano
(symbol and power/place) |
n -9
micro nano pico (+ to -) pico nano micro (- to +) |
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micro
(symbol and power/place) |
u(ish) -6
milli micro nano (+ to -) nano micro milli (- to +) |
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milli
(symbol and power/place) |
m -3
kilo ___ milli micro (+ to -) nano micro milli (- to +) |
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kilo
(symbol and power/place) |
k 3
mega kilo ____ (+ to -) milli ____ kilo (- to +) |
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mega
(symbol and power/place) |
M 6
giga mega kilo (+ to -) ____ kilo mega (- to +) |
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giga
(symbol and power/place) |
G 9
tera giga mega (+ to -) kilo mega giga (- to +) |
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tera
(symbol and power/place) |
T 12
tera giga mega (- to +) kilo mega giga..(+ to -) |
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Valence shell
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The outermost shell of an atom. Electrons in this shell are the valence electrons.
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Free electron
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An electron that has absorbed a photon with sufficient energy to escape from the atom.
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Ion
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When an atom or group of atoms is left with a net charge.
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Coulomb
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The unit of charge. Electrical charge (Q) measured in coulombs, symbolized by C. 6.25 X 10 (18th).
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Voltage
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The difference in potential energy per charge is the potential difference.
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Current
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The movement of electrons.
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Ampere
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(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.
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Resistance
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The opposition to current. Expressed in ohms (Ω)
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Semiconductors have x elctrons in their valence shell.
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4 electons in valence shell.
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Series-connected batteries
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the positive electrode of one cell is connected to the negative electrode of the next and so on.
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Parallel-connected battery
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the positive electrodes of several cells are connected together and all the negative electodes are conncected together. Increases battery capacity.
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A generator converts...
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...mechanical energy into electrical energy using electromagnetic induction.
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A motor converts...
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...electrical energy into mechanical energy.
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Three things necessary to make a generator, alternator, or a motor work.
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Wire
Magnetic Field Motion |
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Resistor size does not...
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...determine resistance value, only how much heat it can get rid of.
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Decode a 4 band resistor
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1st - first digit
2nd - second digit 3rd - number of zeros 4th - percent tolerance |
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Resistor color codes 0 - 4
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black
brown red orange yellow |
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Resistor color codes 5 - 9
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green
blue violet gray white |
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Resistor tolerance colors and values
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gold - plus or minus 5%
silver - plus or minus 10% |
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Third band special multiplier: gold
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multiply the first two-digit result by 0.1
XY x 0.1 = X.Y |
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Third band special multiplier: silver
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Multiply the first two-digit result by 0.01.
XY x .01 = .XY |
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continued
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chapter 2
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Voltage =
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W/Q energy divided by charge(where W is expressed by joules)
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I (current)
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Q/t current equals charge divided by time
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G (conductance)
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1/R Conductance is reciprocal of resistance
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Thermistor
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Type of variable resistor that is temperature sensitive
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Negative thermistor
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resistance chrge inversely with temperature change
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Positive thermistor
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resistance change directly with temperature change
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Load
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an element connected across the output terminals of a circuit that draws current from the source and upon which work is done
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SPST
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single post single throw switch
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DPDT
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double post double throw
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AWG
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American Wire Gauge
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Circular mil
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a unit of cross-sectional area used for wires
CM |
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1CM
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wire with diameter of .001 inch
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