A-D Flashcards
(55 cards)
Electrons and Protons:
flow in alternating directions.
attract each other.
are both transferred during current flow.
repel each other.
attract each other.
Copper is described as a conductor because it has:
less than three electrons in it’s outer shell.
more than five (5) electrons in it’s outer shell.
no electrons in it’s outer shell.
it’s outer shell full of electrons.
less than three electrons in it’s outer shell.
The best insulator has:
it’s outer shell full of electrons.
more than five (5) electrons in it’s outer shell.
less than three (3) electrons in it’s outer shell.
no outer shell.
more than five (5) electrons in it’s outer shell.
Ohms Law states that:
it takes 1 volt of pressure to cause 1 amp of current to flow through 1 ohm of resistance.
Ohms law strictly refers to resistance not voltage and amperage.
it takes 1 volt of current to cause 1 amp of pressure to flow through 1 ohm of resistance.
none of these options are correct
it takes 1 volt of pressure to cause 1 amp of current to flow through 1 ohm of resistance.
When transposing Ohms Law to solve for resistance, the formula is:
R = E / I
R = I / E
R = I x E
None of these options are correct.
R = E / I
Electricity can be generated by the following processes except:
chemical energy
static.
induction
reduction
reduction
I measured circuit amperage using my DMM between the fuse and the switch, between my two loads and also where my ground wire fastens to the frame. the reading that I measured was consistent at all three locations. I have a:
parallel circuit
short circuit
series circuit
series - parallel circuit
series circuit
When measuring in a circuit I saw three (3) different amperage readings and two different voltage readings. I did not take any resistance readings. This must be a:
series - parallel circuit
series circuit.
based on the information supplied it could either be a parallel or a series - parallel circuit, I can’t tell which.
parallel
series - parallel circuit
As the temperature of a copper conductor decreases and the voltage remains the same, the current will:
remain unchanged
increase
decrease
fluctuate
increase
To properly connect the ammeter into the circuit:
be sure to connect in line with the circuit closed.
connect in parallel provided that the current is flowing and the load is operating.
connect in series and be sure the current is flowing and the circuit is closed.
make a shunted connection to protect the circuit as you take the test.
connect in series and be sure the current is flowing and the circuit is closed.
To properly connect the voltmeter into the circuit:
don’t make a parallel connection, the extra branch in parallel will lower circuit resistance and damage the circuit.
make a series connection in an energized circuit.
Correct Answer
make a parallel connection in an energized circuit
make a parallel connection in a de-energized circuit.
make a parallel connection in an energized circuit
When current flowing in a coiled wire is stopped:
shared induction occurs.
the right hand rule for coils no longer applies.
The magnetic flux lines will invert.
the magnetic field will collapse due to loss of amperage.
the magnetic field will collapse due to loss of amperage.
Voltage is induced in a conductor when magnetic field:
has no movement relative to the conductor.
moves around a conductor.
moves through conductor.
is oriented in parallel with a conductor.
Correct Answer
moves through conductor.
The following listed material with the lowest permeability is:
Aluminum
nickel
cobalt
steel
Aluminum
A permanent magnet loses magnetic strength when:
all of these answers are possible.
exposed to shock.
exposed to a DC magnetic field.
cooled.
exposed to shock.
A good conductor offers___________________ resistance to a circuit and this in turn requires___________________ voltage to keep the current constant.
less, more.
more, more.
more, less.
less, less.
less, less.
When one lamp in an electrical lighting circuit burns dimly when compared to the other lamps in the same circuit the probable cause is:
an open.
a short.
high resistance.
a ground fault.
Correct Answer
high resistance.
An incandescent light bulb in a circuit may:
all the supplied options are possible.
produce light.
limit current flow in the circuit.
produce heat.
all the supplied options are possible.
A 12 gauge wire will be able to safely conduct less current than a 16 gauge wire.
True False
Correct Answer
True
Which of these statements is true of a 6 volt automotive battery?
It has 3 cells connected in parallel.
It has 3 cells connected in series.
it has 6 cells connected in parallel.
It has 6 cells connected in series.
It has 3 cells connected in series.
What usually causes a fuse to “blow”?
Too much resistance.
Too little resistance.
Too much voltage.
Too little voltage.
Too little resistance.
An ammeter with an inductive clamp is connected in ______________ with an energized circuit when measuring current flow.
none of these options is correct.
Series-parallel
Parallel
Series
Correct Answer
none of these options is correct.
An ohm meter reading of 2.4 MΩ would be expressed as:
0.000 0024 ohms
0.0024 ohms
2 400 000 ohms
2 400 ohms
2 400 000 ohms
An unintended ground in a circuit may cause the fuse to “blow”. The cause might be:
excessive amperage in the circuit.
excessive voltage flowing in the circuit
the circuit is fine, the fuse is rated to handle this occurrence
excessive resistance in the circuit
excessive amperage in the circuit.
