Chapter 1 Unit 4 Electricity Questions With
Correct Answers
The movement of electrons to perform a useful function is called static electricity -
answer✔False
For current to flow from the power source through the load and then back to the source, the
current path must be conductive - 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. - answer✔False
When electricity is created by chemical activity, electrons will flow in two directions, and this is
called alternating current. - answer✔False
A battery power source where voltaic cells are combined in a series arrangement, positive
terminal to negative terminal, so that the voltage is added to the voltage of the other cells. -
answer✔True
Moving magnetic field through a conductor provides the energy needed to cause the valence
electrons in the conductor to flow in a given direction. - answer✔True
It isn't the force of the magnetic field through a conductor that produces electricity, it is the
relative motion of the field to the electrons within the conductor that produces the movement of
electrons. - answer✔True
Photoelectricity is the principle that photons striking a semiconducting plate cause the plate to
release electrons to another semiconducting plate. - answer✔True
The thermoelectric effect is the process where heat is applied to dissimilar metals joined together
to produce about _________. - answer✔5mV to 30mV
A common application of thermoelectricity is a thermocouple. - answer✔True
Some crystalline materials produce a small electrical voltage when bending or twisting pressure
is applied to them. This is called piezoelectricity. - answer✔True
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