Residential Comp
The NEC requires that all octagon boxes have a minimum depth of ______.
1/2"
What is the applied voltage of a circuit that has 10 amps of current and 12 ohms of resistance?
120 volts
The voltage drop across the parallel resistors in the figure above is ______.
17.3 volts
What is the total resistance of three resistors in parallel with values of 4 ohms, 10 ohms, and 25 ohms?
2.56 ohms
If two 10-ohm resistors are connected in series, what is the total resistance of these resistors?
20 ohms
What is the total resistance of the circuit above?
24.17 ohms
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is ____.
240 volts
What is the total resistance of the circuit in the figure above?
29 ohms
What size of a junction box must be used if there is one 4" conduit and two 3" conduit entering on one side of the junction box and exiting at a 90° angle on another side of the box? (Assume the conductor size is 4 AWG or larger)
30"
Given: A circuit has a voltage of 100 volts across five resistors in parallel (5, 14, 21, 25, and 100 ohms). The total current is _____.
36.9 amps
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two resistors?
4 ohms
How many amps of current would flow through the circuit in the figure above?
4.14 amps
What is the minimum length on a straight pull for a pull box with two 1" conduits and one 5" conduit on one wall, and two 1" conduits and one 5" conduit entering the opposite wall?
40"
If a circuit has 48 amps of current and an applied voltage of 240 volts, the resistance is _____.
5 ohms
A circuit has a source voltage of 50V and a current of 10A. What is the power in watts?
500 watts
What is the applied voltage if the current in a circuit is 60 amps and the resistance is 10 ohms?
600 volts
The total voltage in a circuit with voltage drops of 15V, 25V, and 20V is ______.
60V
How many amps are there in the current of a circuit if the voltage source is 140V and the resistance is 2 ohms?
70 amps
Two resistances of 30 and 25 ohms are connected in parallel. In series with this combination is a 40- ohm resistance, and in parallel with this total combination is a 28-ohm resistance. Given a voltage of 1.28 volts, the total current flowing through the circuit is ______.
70 milliamps
There are four resistors in a circuit with an applied voltage of 120V. The voltage drop across three resistors is 15V each. What is the voltage drop across the fourth resistor?
75V
The NEC is divided into _______.
9 chapters
Which of the following counts as two conductors when used in a box?
A wire that enters a box, and is either spliced or connected to a terminal, and then exits again.
Which of the following will cause the number of conductors allowed in a box to be reduced?
Cable Clamps
The statement that total current entering a point must equal total current leaving that point best describes ______.
Kirchhoff's current law
Which of the following rules contain the words shall or shall not and must be adhered to?
Mandatory rules
Which of the following serves as the introduction to the NEC and provides an overview of the book?
NEC Article 90
The NEC is published by the _____.
National Fire Protection Association
Which type of boxes are typically used for wall mounted lighting fixtures?
Octagon and Round Boxes
A circuit in which two or more components are connected equally across the same voltage source is _____.
Parallel circuit
Which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?
Permissive rules
The duties of the NFPA include which of the following?
Publishing standards to minimize the possibility of fires
NEC Chapter 6 covers ______.
Special Equipment
Which of the following pulls requires the length of the box to be no less than 8 times the trade diameter of the largest raceway?
Straight Pulls
Which of the following is a general NEC article for installing boxes?
The finished installation must be accessible for future repair or maintenance.
What is the primary purpose of the NEC?
To safeguard persons and property from electrical hazards
Which of the following is used to step voltage down to lower levels before it reaches a home or office?
Transformer
NEC Chapter 7 contains information on _____.
emergency systems
Nationally Recognized Testing Laboratory _____.
establish safety standards for electrical equipment
NEC Chapter 5 contains _____.
information on special occupancy areas
In a parallel circuit, the voltage drop _____.
is the same across all loads
You would measure resistance with a(n)
ohmmeter
According to NEC section 210.52, laundry areas require at least how many receptacles?
one
NEC Article 250 contains ____.
requirements for grounding and bonding
Materials with electrical characteristics that fall between those of insulators and conductors are considered _____.
semiconductors
In a parallel circuit, the total line current must equal _______.
the sum of the branch currents
According to Kirchhoff's current law, the current in a parallel circuit is equal to _____.
the sum of the currents in each branch
Ohm's law states that the resistance of a circuit is equal to the _____.
voltage divided by the current
According to Kirchhoff's voltage law, the total voltage drop in a circuit is equal to the ______.
voltage of the power source
