series circuit with a voltage drop of 120 volts has a current of 24 amperes and two resistors in series. The first resistor has a resistance of 3 Ohms. What is the resistance in the second resistor? - ANSWER 2 Ohms
A transformer has a primary coil with 12 turns and a secondary coil with 4 turns....
A series circuit with a voltage drop of 120 volts has a current of 24 amperes and two resistors in series.
The first resistor has a resistance of 3 Ohms. What is the resistance in the second resistor? - ANSWER 2
Ohms
A transformer has a primary coil with 12 turns and a secondary coil with 4 turns. What is the turn ratio of
this transformer? - ANSWER
A step-down transformer with a turn ratio of 3:1 has a primary coil with 36 turns. How many turns does
it have in its secondary coil? - ANSWER
Three 2-Ohm resistors are wired together in a circuit. Two of the resistors are wired together in parallel.
Their combination is then wired in series to the third resistor. What is the total resistance of the three
resistors wired in this configuration? - ANSWER 3 Ohms
When installing three 3/0 THHW copper ungrounded conductors in electrical metallic tubing (EMT), what
is the amperage for each conductor with the temperature rating of a conductor in column 75°C,
operating in an ambient temperature of 40°C? - ANSWER
What minimum two-gang (old work) plastic box is required with two 14/2 and two 12/2 nonmetallic
cables with two devices, including integral clamp assembly inside the box? - ANSWER
A 2-Ohm resistor and a 3-Ohm resistor are wired together in a circuit. Which of the following is a true
statement? - ANSWER The total resistance of the circuit is 5 Ohms when the 2-Ohm and 3-Ohm resistors
are wired in series
A 2-Ohm resistor and a 5-Ohm resistor are wired in parallel. If there is a voltage drop of 10 volts across
the 5-Ohm resistor, what is the voltage drop across the 2-Ohm resistor? - ANSWER Since the resistors are
, in parallel, the voltage drop across each resistor is the same. Therefore, the voltage drop across the 2-
Ohm resistor would also be 10 volts.
An application requires the use of moisture- and heat-resistant thermoplastic insulated conductors.
Which code describes this type of insulation? - ANSWER
If 1.5 amperes of electrical current is flowing through a resistor that is connected to a 3-volt voltage
source, what is the resistance of the resistor? - ANSWER 2 ohms
What size breaker is used in a dwelling unit panel for a hot water heater rated at 4,500 watts, 240 volts?
- ANSWER 20-ampere breaker
An application is designed to use No. 14 AWG copper TW wire installed in free air. What is the ampacity
of this conductor? - ANSWER
Four resistors, A, B, C, and D, are wired together in a circuit. Resistors A and B are wired together in
parallel. Resistors C and D are also wired together in parallel. These two parallel combinations are then
wired together in series. If 2 amperes of electrical current flow through resistor A, 6 amperes flow
through resistor B, and 1 ampere flows through resistor C, how much electrical current flows through
resistor D? - ANSWER
What resistance would a rheostat need to have in order to have the same resistance as a 2-Ohm resistor
and a 12-Ohm resistor that are wired in series? - ANSWER 14 Ohms
What copper gauge (AWG) conductor(s) is required for the above hot water heater? - ANSWER
What is the total resistance of a 3-Ohm resistor, a 5-Ohm resistor, and a 6-Ohm resistor if the three
resistors are all wired in series? - ANSWER 14 Ohms
A 5-Ohm resistor, a 7-Ohm resistor, and an 8-Ohm resistor are all wired together in series. If the resistors
are connected to an 8-volt source, how much electrical current will flow through the circuit? - ANSWER
0.4 Amperes (or 400 milliamperes)
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