SLTC – FINAL EXAM 2025 QUESTIONS
AND ANSWERS
What do all atoms contain? - ANS protons, neutrons, electrons
Protons are ______ charged - ANS positively
Electrons are _____ charged - ANS negatively
There are two important factors to understanding atoms: - ANS 1. the law of charges states
that opposites attract an likes repel.
2. the law of centrifugal force states that a spinning object will pull away from its center point
and that the faster it spins the greater the force becomes.
What is the outermost shell of an atom? - ANS valence shell
What are the three categories of an atom? - ANS 1. Conductors
2. Insulators
3. Semiconductors
How many valence electrons so conductors have? - ANS 3 or less
How many valence electrons do insulators have? - ANS 5 or more
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,How many valence electrons do semi-conductors have? - ANS 4
True or False: One fundamental law of physics states that energy can be converted from one
form to another but can not be created nor destroyed. - ANS True
What are the 6 basic sources of energy that can be used to detach electrons from their orbits
and sustain current? - ANS 1. Friction
2. Heat
3. Pressure
4. Chemical Reaction
5. Light
6. Magnetism
Which 4 sources of energy are used primarily in special applications? - ANS 1. Friction
2. Heat.
3. Pressure
4. Light
Which 2 sources of energy are more commonly used to produce large amounts of energy? -
ANS 1. Chemical Reaction
2. Magnetism
True or False: Static electricity mean moving (lighting is static electricity) - ANS False: Static
electricity does not move (lighting still is static)
True or False: DC current does not change unless it is turned on or off. - ANS True
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, True or False: AC currents never change direction in the electromagnetic field. - ANS False:
AC current changes direction many times per second in the electromagnetic field.
Electrical current is the movement, or flow, of electrons. Current is measured in _______. -
ANS Amperes
True or False: One amp of current flows through a conductor when one coulomb flows past a
given point in one second. - ANS True
Voltage affects many things including: - ANS 1. The amount of insulation needed for a given
power
2. The separation required between line conductors
3. Safe working practices
4. The types of tools needed
The rate of 1 joule of work in 1 second is the basic unit of power, and is called a ______. -
ANS Watt
A power level of 1 horse power is approximately equivalent to ______ watts. - ANS 746
The relationship between current, voltage, and resistance was described by Georg Simon Ohm
in a form that is commonly referred to as ______ ___. - ANS Ohm's Law
Power (watts) is calculated by multiplying _______ times _______. - ANS Voltage and Amps
When talking about AC voltage, positive and negative refer to the direction or current flow.
Positive voltage causes electrons to flow away from the stations and negative voltage causes
electrons to flow _____ towards the generating station. - ANS Towards
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AND ANSWERS
What do all atoms contain? - ANS protons, neutrons, electrons
Protons are ______ charged - ANS positively
Electrons are _____ charged - ANS negatively
There are two important factors to understanding atoms: - ANS 1. the law of charges states
that opposites attract an likes repel.
2. the law of centrifugal force states that a spinning object will pull away from its center point
and that the faster it spins the greater the force becomes.
What is the outermost shell of an atom? - ANS valence shell
What are the three categories of an atom? - ANS 1. Conductors
2. Insulators
3. Semiconductors
How many valence electrons so conductors have? - ANS 3 or less
How many valence electrons do insulators have? - ANS 5 or more
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,How many valence electrons do semi-conductors have? - ANS 4
True or False: One fundamental law of physics states that energy can be converted from one
form to another but can not be created nor destroyed. - ANS True
What are the 6 basic sources of energy that can be used to detach electrons from their orbits
and sustain current? - ANS 1. Friction
2. Heat
3. Pressure
4. Chemical Reaction
5. Light
6. Magnetism
Which 4 sources of energy are used primarily in special applications? - ANS 1. Friction
2. Heat.
3. Pressure
4. Light
Which 2 sources of energy are more commonly used to produce large amounts of energy? -
ANS 1. Chemical Reaction
2. Magnetism
True or False: Static electricity mean moving (lighting is static electricity) - ANS False: Static
electricity does not move (lighting still is static)
True or False: DC current does not change unless it is turned on or off. - ANS True
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, True or False: AC currents never change direction in the electromagnetic field. - ANS False:
AC current changes direction many times per second in the electromagnetic field.
Electrical current is the movement, or flow, of electrons. Current is measured in _______. -
ANS Amperes
True or False: One amp of current flows through a conductor when one coulomb flows past a
given point in one second. - ANS True
Voltage affects many things including: - ANS 1. The amount of insulation needed for a given
power
2. The separation required between line conductors
3. Safe working practices
4. The types of tools needed
The rate of 1 joule of work in 1 second is the basic unit of power, and is called a ______. -
ANS Watt
A power level of 1 horse power is approximately equivalent to ______ watts. - ANS 746
The relationship between current, voltage, and resistance was described by Georg Simon Ohm
in a form that is commonly referred to as ______ ___. - ANS Ohm's Law
Power (watts) is calculated by multiplying _______ times _______. - ANS Voltage and Amps
When talking about AC voltage, positive and negative refer to the direction or current flow.
Positive voltage causes electrons to flow away from the stations and negative voltage causes
electrons to flow _____ towards the generating station. - ANS Towards
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