Deck 7: Resistance

Question 1

Fixed resistors are generally produced in standard values, and the lower the tolerance value, the fewer resistance values available.

Answer 1

False

Question 2

Fixed resistors have two ohmic values that cannot be changed or adjusted.

Answer 2

False

Question 3

The American Wire Gauge is used mainly in the United States for the diameters of round, solid, nonferrous electrical wire.

Answer 3

True

Question 4

Resistors are commonly used to perform two functions in a circuit: to limit the flow of current through the circuit and ____.

A)to produce a voltage divider
B)to separate points in a circuit
C)to produce a watt divider
D)to separate field effects

Question 5

The American Wire Gauge assigns numbers from ____; the larger the number, the smaller the wire.

A)0 to 10
B)0 to 28
C)0 to 44
D)0 to 50

Question 6

The resistance of any conductor is directly proportional to its ____.

A)height
B)length
C)width
D)weight

Question 7

The thicker a wire, the greater its resistance.

Question 8

Copper is almost as good a conductor as ____, is relatively inexpensive, and serves for most types of wiring.

A)aluminum
B)nickel
C)cadmium
D)silver

Question 9

Carbon resistors are very popular for most applications because they are inexpensive and readily available.They are made in standard values that range from about 1 ohm to about ____ ohms.

A)5,000
B)750,000
C)1.5 million
D)22 million

Question 10

A rope-stranded cable consists of several ____ cables twisted together.

A)bunched
B)braided
C)concentric
D)single

Question 11

Variable resistors are known by several common names, including potentiometer and ____.

A)rheostat
B)timostat
C)rhysostat
D)rheometer

Question 12

Conductors and insulators merely represent two extremes between which a great variety of materials are classified as poor conductors or semiconductors.

Question 13

The resistance of ____, such as germanium and metal oxides, decreases very rapidly as the temperature goes up.

A)semiconductors
B)conductors
C)multiple conductors
D)nonconductors

Question 14

For concentric wire stranding, a center wire is surrounded by one or more definite layers of wires, and each wire layer contains four wires more than the layer immediately beneath it.

Question 15

Resistors can have a power rating in ____.

A)amperes
B)volts
C)CMs
D)watts

Question 16

The rate at which metals increase in resistance at normal temperatures is called the temperature coefficient of resistance.

Question 17

Resistors come in various sizes, types, and ratings to accommodate the needs of almost any circuit application.

Question 18

As the temperature rises, the resistance of metals decreases.

Question 19

Just how much resistance a conductor has depends on four factors, namely the type of material from which it is made, the conductor's length, its cross-sectional area (thickness), and its ____.

A)height
B)density
C)temperature
D)mass

Question 20

Materials whose atomic structures do not readily provide free electrons are referred to as good conductors.