NCTI Installer Tech/November Questions and Answers 2024/2025
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NCTI
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NCTI
Why do only the outer electrons leave their orbit shells?
Only outer electrons leave their orbit shells because electrons farthest from the nucleus
are more easily freed from their orbits due to a weaker electrostatic force.
What is required to have a balanced (or stable) atom?
The num...
NCTI Installer Tech/November Questions
and Answers 2024/2025
Why do only the outer electrons leave their orbit shells?
Only outer electrons leave their orbit shells because electrons farthest from the nucleus
are more easily freed from their orbits due to a weaker electrostatic force.
What is required to have a balanced (or stable) atom?
The number of electrons must equal the number of protons in order to have a
balanced atom.
List the capacity of each of the first four orbital shells of an atom.
The movement of atoms in materials that are conductors and the agitation as they
collide cause electrons to be knocked loose and travel randomly from one atom to
another.
What can force electrons to all move in the same direction?
Applying a negative charge to one end of the wire and a positive charge to the other
can force electrons to all move in the same direction. The electrons in the wire will
travel toward the positive charge as they are directed by the effects of the unlike
charges.
What actually produces electric current?
The transfer of energy from valence electron to valence electron, as a result of
applied charges, is what actually produces electric current.
How does the speed of electric current compare to that of electron travel?
The effective speed of electric current (186,000 miles per second) is much faster than
the actual speed of electron travel (a few hundred miles per second).
How many electrons are in one coulomb?
A coulomb is equal to 6.28 × 1018 electrons.
What is the basic measurement unit of electron current?
The ampere is the basic measurement unit for electron current.
Define ampere in terms of coulombs.
An ampere is equal to 1 coulomb passing a given point during 1 second.
Name the three terms that are used interchangeably to refer to the force that causes current
Potential difference, electromotive force (emf), and voltageare used interchangeably
to refer to the force that causes current flow.
Define electromotive force (emf).
Emf is the electrical force that motivates electrons to move in a wire.
What does the term potential difference mean?
Potential difference is the algebraic difference between the electrical individual
potentials of two points.
What is the potential difference between two negative charges of equal value?
The potential difference between two negative charges of equal value is zero. There
is no potential difference.
What is the unit used to indicate the strength or size of the potential difference?
The volt is the unit used to indicate the strength or size of the potential difference.
Define a volt in terms of current and resistance.
One volt is the amount of force required to produce a current of 1 ampere through a
resistance of 1 Ω.
What are three alternate ways to express 5 µV and 3 mA?
5 microvolts, 5/1,000,000 volt or 0.000005 volt, and 3 milliamperes, 3/1,000
ampere or 0.003 A.
What are two alternate ways to express 2 megavolts?
2 MV or 2 million volts.
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