Basic Electrical Theory- Unit 4-Electricity
Exam Questions With Correct Answers
The movement of electrons to perform a useful function is called "static electricity." T/F -
answer✔False. The movement of electrons to perform a useful function is called
ELECTRICITY
For current to flow from the power source through the load and then back to the power source,
the current path must be conductive. T/F - answer✔True
The time it takes for an overcurrent protection device to open is directly proportional to the
magnitude of the fault current. T/F - answer✔False. The time it takes for an overcurrent
protection device to open is INVERSELY proportional to the magnitude of the fault current.
Fires can be caused by electrical energy when _____ from an arcing electric fault ignites
adjacent combustible materials. - answer✔Current
An electric arc blast can approach _____, which vaporizes metal parts and produces an explosive
and deadly pressure wave. - answer✔30,000 F
To ensure the minimum practical safeguarding of persons and property from the use of
electricity, all premises wiring must be installed in accordance with the National Electrical Code
(NEC). T/F - answer✔True
To force electrons to move, some form of energy must be applied to the electrons to cause them
to leave their atom. This energy can only be supplied by magnetism. T/F - answer✔False. To
force electrons to move, some form of energy must be applied to the electrons to cause them to
leave their atom. This energy can be supplied by CHEMICAL ACTIVITY, MAGNETISM,
LIGHT, HEAT OR PRESSURE.
When electricity is created by chemical activity, the electrons will flow in two directions. This is
called "alternating current." T/F - answer✔False. When electricity is created by chemical
activity, the electrons will flow in ONE GIVEN direction. This is called "DIRECT CURRENT."
A battery is a power source where voltaic cells are combined in a series arrangement, positive
terminal to negative terminal, so that the voltage of one cell is added to the voltage of the other
cells. T/F - answer✔True
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