ch 12345

What part of an atom has a negative charge ?

electron

Electrical current is the flow of __________.

electrons

The number of cycles completed in one second is called a

frequency

The neutral conductor is also referred to the __________ conductor.

grounded

A complete circuit is often referred to as a(n) ___________ circuit.

closed

There are six current-carrying conductors in a raceway that is to be installed in an area with an ambient temperature of 90 degrees F. It is necessary to __

correct for temperature and derate because of the number of conductors

In series circuits, the ____________ is the same at any point in the circuit.

current

The term "load" refers to the amount of __________ in a branch circuit.

current

When a circuit has only one path, the __________is the same at any point.

current

Parallel circuits are also referred to as ___________

current dividers

The unit circular mil is equal to the ______

diameter of the wire in mils

What type of current reverses its direction of flow at regular intervals ?

direct alternating

What are the three principle parts of an atom ?

electron, neutron, and proton

In a series circuit, the sum of the voltage drops is ____________ the applied voltage.

equal to

Both AC and DC can be transformed

fals

All insulations perform equally well in dry, damp, and wet locations.

false

During normal operation of a typical 120-volt appliance circuit, current flows through the hot, grounding, and neutral conductors.

false

1/1 Frequency is measured in _____________

hertz

The longer the conductor, the more _____________ it will have.

resistance

What is indicated by the fourth color band on a resistor?

tolerance

A grounding conductor helps prevent a shock hazard in the event that an ungrounded, or hot, conductor comes in contact with the case or frame of an appliance.

true

The value of a resistor can often be determined by the color code.

true

Direct current is described as

unidrectional

What force pushes the electrons through a resistance in a circuit?

voltage

What is another term for electromotive force (EMF)?

voltage

The amount of electrical power being used in a circuit is measured in _____________.

watts

If a circuit is open, current ____________ flow.

will not

A series circuit has a total resistance of 180 ohms and a applied voltage of 120 V. What is the current flow?

.667

A parallel circuit composed of a 150 ohm and a 270 ohm resistor has a voltage of 120V. What is the current in the 150 ohm resistor?

.8A

A conductor is made from a material that contains between ________ valence electrons.

1 and 3

A two branch parallel circuit has resistors of 30 ohms and a 15 ohm resistor. What is the total resistance?

10

An electrical circuit has a voltage of 50V and a resistance of 5 ohms. What is the value of current?

10A

A three resistor circuit has a total power of 25W. Two of the resistors dissipate 10W and 5W, respectively. How much power does the third resistor dissipate?

10w

An electric circuit has a resistance of 20 ohms. The current is measured to be 6 A. How many volts are applied to the circuit?

120

A toaster is listed as 1560 W. When it is plugged into a 120 V circuit and starts to make toast, how many amperes will it draw?

13

A three branch parallel circuit has a total resistance of 385.83 ohms, Two of the resistors are 680 ohms and 1500 ohms. What is the value of the third resistor?

2200

If there are more than _________ conductors in a raceway, the ampacity of the conductors must be derated.

3

A parallel circuit is composed of two 60 ohm resistors. What is the total resistance?

30

The ampacities listed in T.310.15(B)(16) are based on an ambient temperature of ________________.

30 degree F

The NEC ___________ contains tables dealing with conductors for general wiring.

310

An electric motor is running on 120V. The current is measured to be 2 A. How many ohms of resistance is the motor?

60

A two resistor series circuit has an applied voltage of 100V. The voltage across one of the resistors is 40V. What is the voltage across the other resistor?

600v

An insulator is a material containing _________ valence electrons.

7 or 8

A three branch parallel circuit has resistors of 27 ohms, 56 ohms, and 15 ohms. What is the total resistance?

8.23

What is the applied voltage in a series circuit with two resistors (25V and 60 V respectively)?

85v

A series circuit has a total resistance of 240 ohms and a current flow of 4 A. What is the applied voltage?

960V

In the NEC the current carrying abilities of conductors are called the ______________.

ampacities

In parallel circuits, the voltage drop across any branch is the same as the

applied voltage

A basic laws of magnetism states that unlike poles ________ and like poles ____________

attract, repel

A combination circuit is a circuit that contains ___________.

bothe series and parallel components

In a parallel circuit, the total resistance is __________ value resistor.

less than the lowest

What is the most common method of producing electricity ?

magnetism

A method for finding total resistance of parallel resistors is _____________.

resistors of equal value product over sum reciprocal formula (all of these)

A circuit that has only one path for current flow is a ___________ circuit.

series

There is very little resistance and a large amount of current flow in a(n) ___________ circuit.

short

What type of circuit generally occurs when the conductors leading from and back to the power source become connected ?

short

In a parallel circuit, the total current flow is equal to the ___________ of the currents through all the branches.

sum

The ambient air temperature considered in relation to a conductor ampacity is the temperature of the _______

surrounding air

When a conductor is very large it may become necessary to connect them in

parrallel

What part of an atom has a positive charge ?

proton

Solving combination circuits includes a step in which you

recuce the circuit to asimpler circuit

The basic law of physics states that like charges __________ and opposite charges __________.

repel ; attract

What force is demonstrated in objects with like charges

repulsion

What force is demonstrated in objects with unlike charges ?

repulsion

Circuits that have more than one path for current flow are ___________ circuits. (1pts)

parallel

A voltage ____________ is used to provide different voltages between certain points in a circuit.

divider

What standard prefix in engineering notation indicates multiplication by 1,000?

mega

What part of an atom has no charge ?

neutron

A junction point of current paths is often called a __________.

node

The unit of resistance to current flow is the ____________.

ohm