NAVEDTRA 14173 ch3 Flashcards
A device that changes electrical energy into a more useful form
Load
Which device furnishes the electrical energy used by the load?
Source
What permits control of the electrical device and interrupts the current delivered to its load
Switch
What is a technicians main aid in troubleshooting a circuit in a piece of equipment
Schematic diagrams
Who proved that a precise relationship exists between current(I), voltage(V), and resistance(r)
George Simon Ohm
Ohm’s law
What is the basic tool used to solve electrical problems
Algebra
What can be constructed to easily analyze a circuit?
Graph
The rate at which work is being done
Power(P)
What unit is electric power rate measured in?
Watts
What is the basic unit of power
Watts
What indicates the RATE at which a device converts ELECTRICAL ENERGY into another form of energy
Power Rating
I’m a circuit, what is the safety factor %
50%
WIREWOUND resistors are used when the wattage ratings are higher than ____watts
5
WIREWOUND resistors are made in values between ___ and ___ watts
5 and 200 watts
What is the ratio of power converted to USEFUL energy divided by the power consumed by the device called
Efficiency
How many watts = 1 horse power
746 watts
What is a complete conducting pathway called
Electrical circuit
When a resistor consumes power it puts out ________
Heat
The total resistance in a series circuit is equal to the sum of what?
Individual resistance
What year did Kirchhoff extend ohms law by adding voltages?
1847
Voltage drop1 + voltage drop2 = 0 is what theory
Kirchoffs voltage law
Why are end sources that would force current in the OPPOSITE direction
Series opposing
What term is used to denote a common electrical point of ZERO potential
Ground
What is the common ground for many electrical circuits in most equipment
Metal chassis
An accidental PATH OF LOW RESISTANCE which allows high amounts of current to pass is what
Short circuit
A break in a circuit is called ______
An open
The total resistance of a parallel circuit is always LESS than the resistance of any _________
Branch
What type of circuit contains elements of a parallel and a series circuit
Combination circuit
What are the points where current divides
Junctions
Think about junction boxes
What type of current DOES NOT flow through any of the load devices
Bleeder
Fatalities from voltages as low as _____ bolts have been recorded
30
What is used to fight electrical fires on electrical equipment
CO2
What is current inversely proportional to
Resistance
I =V/R
R = V/I
