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41 Cards in this Set

  • Front
  • Back
Technology
The use of tools materails and knowledge to slove problems
Electricity
Moving electrons
Practical Circuit
a collection of devices that let use use electricity saftly and effieciently
Parts of a circuit
load,source,complete conductor path,control, and protection
Circuit problems
Open circuit-conductor path is not complete
Short circuit-electricity can flow through the circuit without going though the load
Volt
measure of electrical pressure
Amp
measure of the rate of flow of electricity
Ohm
measure of electrical resistence
Series circuit
only one path for the current to flow through
Parallel circuit
more than one path for the current to flow through
Combonation Circuit
combines both series and parallel circuits into one circuit
Insulator
a material that i different (but not impossible) for electricity to flow though
Conductor
a material that is easy for electricity to flow through
Type NM
Nonmetallic outer covering
14
wire gage
2
2 conductors (one black and one white)
W/G
with gage wire
Duplex outlet (color coding rules)
White wire directly to one side of the applience

Black wire directly to second side of the applience
One lamp controlled by one SPST switch
White wire directly to one side of the applience

Black wire to one side of switch

Black wire from second side of switch to applience
Schematic Drawing
uses symbols to represent electrical components
SPST
single pole double throw
SPDT
single pole double throw
DPDT
double pole double throw
DPST
double pole single throw
The fatal current
.01 amp
Ground fault
is a small elcetrical current that "leaks" from the hot wire to ground. A ground fault can produce a severe electric shock in damp locations.
Ground fault circuit interrupter (GCFI)
a protective device that detects even small ground faults and disconnects the circuit
Solder
an alloy of tin and lead
Alloy
a combination of two or more metals that has properties different from any of the original metals
Flux
a chemical that cleans metal so that the solder will stick to it
Splice
a mechanical connection between two or more wires
Relay
a magnetically operated switch
N.O. contact
normally open- contact is open when relay is off
N.C. contact
normally open- contact is closed when relay is off
to find current
current = Volts divided by ohms (I= divided by R)
to find volts
volts= volts = amps X ohms
to find ohms
ohms = volts divided by amps ( R= E divided by I)
To solve ohm's law equations
1. write down the equation
2. put the values you know
3. do the math
4. label your answer
Energy
(quantity) the ability to do work or bring about a change
(measured in kilowatt hours)
Power
(rate) the rate at which work is being done (measured in watts or horsepower)
Ohms' Law
the mathmatical relationship between volts, amps, ans ohms in a circuit