Exam 1 Flashcards
1.5k ohms is equivalent to
5000 ohms
____ will cause a circuit to trip or a fuse to blow
A short circuit
A current flow of .006 amps can be expressed as
6 mA
A digital VIM will supply voltage to the test leads when set on
The Ohm mode
A fuse of circuit breaker ____
Should be wired in series with the load
A good example of a ferromagnetic material could be
Iron
A good example of a material with one valence electron would be
Silver
A series circuit is a circuit that has ____ paths for current flow
Only one
A static change can be
Positive or negative
A typical 120V household branch circuit has a properly sized fuse in series with the load, the fuse will open if ____
All of the above
According to the NEC table 310-16, a copper conductor can carry ____ current as an aluminum conductor of equal size and insulation type
A large amount of
Clamp on ammeters measure the amount of current flow in a conductor by ____
Sensing the strength of the magnetic field around the conductor
Current flow in a parallel circuit is
Additive
Current flow is measured in
Amps
Eight 1.4V NiCad c L’s rated 40 Ahr have been wired in series the battery will have a rating of
11.2 V / 40 Ahr
Electrons can be displaced from the atoms by the use of
All of the above
If four 6 volt batteries are wired in parallel their combined voltage would be
6 volts
In order for electricity to produce power
The electrical energy in the circuit must be converted into other forms of energy
Magnetic line of flux ____
Repel each other
Magnetic lines of force ____
Flow from north to south
Name the device the would not fr considered a load in an electric current
Switch
Of the following conductors, which would have the highest current carrying capacity
AWG #12 THHN
Of the following instruments the type that would automatically select the proper voltage range when an unknown voltage is applied is ____
An auto ranging multimeter
One important quality of nickel cadmium batteries is
They have an extremely long life span
Overcharging a cell can result in
All of the above
Power in a circuit is measured in
Watts
Power must never be applied to a multimeter when it is set to read ____
Resistance
Resistance is measured in
Ohms
Seventy five milliamps can be written as
0.75A
The ____ is the quality of electrons
Coulomb
The atom is made up of
Protons, neutrons, electrons
The device that provides protection from a lightning strike by arching the current to ground would be
The lightning rod
The electron is a particle that carry’s ____ charge
Negative
The instrument used to test the specific gravity of an electrolytic solution in a battery
A hydrometer
The law of charges states ____
Like charges repel, unlike charges attract
The term electrical pressure and potential are sometimes used to describe
Voltage
The term which represents an opposition to current flow in a DC circuit ____
Resistor
The type of cell that can be recharged would be ____
Secondary
To check the source voltage in parallel circuit, you must connect the voltmeter ____
Across the load in any branch circuit
Voltage drop across any load in a parallel circuit
Remains the same regardless of resistance
What are valence electrons?
Electrons located in the outermost orbit of an electron
What is an insulator?
A material that hinders the flow of electricity
What is the current capacity of a THHN #6 AWG copper conductor in a raceway with an other conductor, operating in ambient temperature of 86 F
75 Amps
What type of instrument produces a two dimensional image of a sine wave by measuring an amount of voltage during a period of time?
The oscilloscope
When a ____ is used in a circuit it must be connected in series with the loads
Ammeter
When cells are connected in series ____
Voltage will add and the current capacity will stay the same
When running conductors over long distances, you must keep the wire’s ____ to a minimum to prevent excessive voltage drops
Resistance
When solving a combination circuit problem
Use both series and parallel circuit rules
Which of the following laws applies to all circuits
Power is additive
Which statement is true regarding voltage drop in a series circuit
The sum of all voltage drops on a circuit must be equal to the applied voltage
