JATC - Study Unit test 2 + 3 Questions
and 100% Correct Answers
Electric Current answer - The flow of electrons through a conductor.
Unit of Electric Current answer - Ampere / A
Opposition to current flow answer - Resistance / (R)
Unit of Electrical Potential answer - Volt / V
Unit of Electrical Power answer - Watt / W
Voltage in a given circuit is increased so current will answer - Increase
Resistance is a given circuit is increased so current will answer - Decrease
____ in a circuit is the amount of work being done per unit of time. answer - Power
One horsepower equals answer - 746 watts
Direct Current (DC) circuit, current flows answer - Single direction
Alternating Current (AC) circuit, current flows answer - Both direction
, ___ waveform will not cross the zero axis answer - DC
___ waveform will cross the zero axis answer - AC
Most common frequency in the US? answer - 60 Hz
Voltage Waveform with 60 Hz answer - Completes 60 Hz cycles in 1 second.
___ is easier to transform answer - AC Voltage
AC transformers allow answer - Very high values to deliver large amounts of power at low
current levels.
AC can easily transformed to answer - Raise or lower levels of voltage and current for a given
amount of power.
When distributed by transmission lines, power loss is due to the ___ of the wire that generates
heat in the conductor. The heat is generated as a result of ___ flowing through the conductor
answer - resistance / current
The power loss of a transmission line can be reduced by either reducing the ___ of the wire or
the amount of ___ . answer - resistance / current
Reducing the resistance of the wire by one-half will reduce power loss by ___ , but reducing the
current by one-half will reduce the power loss by ___ answer - 50% / 75%
By using transformers answer - AC is converted from one level of voltage for transmission and
then reduced to a different level of voltage by the end-user.
and 100% Correct Answers
Electric Current answer - The flow of electrons through a conductor.
Unit of Electric Current answer - Ampere / A
Opposition to current flow answer - Resistance / (R)
Unit of Electrical Potential answer - Volt / V
Unit of Electrical Power answer - Watt / W
Voltage in a given circuit is increased so current will answer - Increase
Resistance is a given circuit is increased so current will answer - Decrease
____ in a circuit is the amount of work being done per unit of time. answer - Power
One horsepower equals answer - 746 watts
Direct Current (DC) circuit, current flows answer - Single direction
Alternating Current (AC) circuit, current flows answer - Both direction
, ___ waveform will not cross the zero axis answer - DC
___ waveform will cross the zero axis answer - AC
Most common frequency in the US? answer - 60 Hz
Voltage Waveform with 60 Hz answer - Completes 60 Hz cycles in 1 second.
___ is easier to transform answer - AC Voltage
AC transformers allow answer - Very high values to deliver large amounts of power at low
current levels.
AC can easily transformed to answer - Raise or lower levels of voltage and current for a given
amount of power.
When distributed by transmission lines, power loss is due to the ___ of the wire that generates
heat in the conductor. The heat is generated as a result of ___ flowing through the conductor
answer - resistance / current
The power loss of a transmission line can be reduced by either reducing the ___ of the wire or
the amount of ___ . answer - resistance / current
Reducing the resistance of the wire by one-half will reduce power loss by ___ , but reducing the
current by one-half will reduce the power loss by ___ answer - 50% / 75%
By using transformers answer - AC is converted from one level of voltage for transmission and
then reduced to a different level of voltage by the end-user.
