Resistors

Question 1

Carbon film resistor

Answer 1

a resistor that is produced by coating a nonconductive material with a film of carbon

Question 2

Composition carbon resistor

Answer 2

resistors that are made by mixing carbon with other compounds to produce a substrate that has a known resistance

Question 3

Fixed resistor

Answer 3

resistor that has a value that cannot be changed

Question 4

Metal film resistor

Answer 4

resistor that is produced by coating a nonconductive material with a film of metal

Question 5

Metal glaze resistor

Answer 5

resistor that is produced by applying a mixture of metal and glass to a nonconductive material

Question 6

Multiturn variable resistor

Answer 6

variable resistor that requires multiple turns to change their resistance values

Question 7

When is a multiturn variable resistor used

Answer 7

when a precise control of measurement is required

Question 8

Potentiometer

Answer 8

variable resistor that has a sliding contact that is used as a voltage divider

Question 9

Rheostat

Answer 9

variable resistor

Question 10

Tolerance

Answer 10

amount of variation from a standard value that is permissible

Question 11

Variable resistor

Answer 11

resistor whose resistance value can be varied between its minimum and its maximum values

Question 12

Voltage divider

Answer 12

circuit that generally is constructed by connecting resistors in series to produce desired voltage drops across the resistors

Question 13

Wire wound resistors

Answer 13

resistors that are constructed by winding resistive wire around a nonconductive material

Question 14

Two reasons resistors are used

Answer 14

limit current flow
voltage dividers

Question 15

How is resistance related to area of a resistor

Answer 15

they are inversely proportional (if area increases, resistance decreases)

Question 16

How is resistance related to length of a resistor

Answer 16

they are directly related (if length increases resistance increases)

Question 17

List the types of fixed resistors

Answer 17

composition carbon
metal film
metal glaze
carbon film
wire wound

Question 18

What is/are disadvantage(s) of composition carbon resistors

Answer 18

they change value as they age or if they are overheated

Question 19

What are advantages of metal film resistors

Answer 19

their value doesn’t change with age
have better tolerance

Question 20

What determines the resistance of a wire wound resistor

Answer 20

type of material used to make the wire
diameter of the wire
length of the wire

Question 21

Why are carbon resistors popular in most applicatons

Answer 21

they are inexpensive

Question 22

How is a metal glaze resistor made

Answer 22

combining metal with glass

Question 23

When are wire wound resistors used

Answer 23

when a higher power rating is needed

Question 24

What is a major advantage of wire wound resistors

Answer 24

they can operate at a higher temperature than other resistors

Question 25

How should wire wound resistors with a hollow centre should be mounted

Answer 25

vertically to allow air flow

Question 26

What happens if the power rating of a resistor is exceeded

Answer 26

the resistor can be damaged

Question 27

What unit is used to describe power ratings of resistors

Answer 27

Watts

Question 28

What does the power rating of a resistor describe

Answer 28

the amount of heat that must be dissipated by the resistor