Resistors

Question 0

Fixed resistors

Answer 0

Have a fixed or unchangeable value of resistance in ohms

Question 1

What are the two categories for resistors?

Answer 1

Fixed resistor and variable resistor

Question 2

Three (3) types of fixed resistors

Answer 2

Composition, film resistor and wire wound resistor

Question 3

Composition resistor and it’s materials

Answer 3

Commonly used, general purpose resistor. Made of a carbon based alloy together with a binder. Binder holds resistive materials together so formed in cylindrical shape. Wore leads are connected to ends and given protective coating.

Question 4

Film resistors?

Answer 4

Constructed by forming a thin film of resistive material onto a ceramic glass core, such as nickel-chromium. Core fitted with metal end caps wire leads are attached.

Question 5

Wire wound resistors?

Answer 5

Constructed by winding a resistance wire around a ceramic core. The wire and the core then surrounded by ceramic or adhesive insulation material.

Question 6

Variable resistor?

Answer 6

Can have resistance value changed. As you change the position of sliding contact you change the resistance value.

Question 7

Rheostats

Answer 7

Rheostats is a variable resistor that has two connections points or terminals. One connected to slider contact
Ex time devices, speed, temperature

Question 8

Potentiometers

Answer 8

Variable resistor with three connection points. Two fixed to ends or resistor and one moving sliding contact wiper

Question 9

2 variable resistors

Answer 9

Potentiometers and rheostats

Question 10

Wire-wound resistors

Answer 10

A wirewound resistor is constructed by winding resistance wire around a ceramic core

Question 11

Variable resistors

Answer 11

Variable resistor can also use a resistive surface made of composition or film instead of wound wire.

Question 12

Rheostats

Answer 12

Adjusting current limits the amount of current, varies current to load. Two terminal devices

Question 13

Rheostats

Answer 13

is a variable resistor it has to connection points or terminals one connected to a slider or wiper contact example control of time devices – speed

Question 14

Potentiometers

Answer 14

A variable resistor that has three connection points or terminals. Two terminals are fixed to The ends of the resistor in the third terminal is connected to a sliding contact sliding contact or wiper along the resistant surface varies their assistance proportionally between to fix terminals

Question 15

Ratings of fixed resistor

Answer 15

Resistance rating – power rating – tolerance rating

Question 16

Resistance raiting

Answer 16

There are several ways to find the resistance value of a resistor the resistance value may be directly printed on the resistor

Question 17

R

Answer 17

R represents the decimal place of the number of ohms for instants are tutu is 0.22

Question 18

Power rating

Answer 18

The power rating in Watts of a resistor indicates the rate at which the resistor can convert the electrical energy into heat energy without overheating, The larger the current through a resistor is the greater the heat dissipated by resistor

Question 19

Tolerance rating

Answer 19

The tolerance rating of a resistor is the degree of accuracy of a labeled resistance value. Tolerance rating is given as a percentage example the talent rating of 10% for 5.1 is 5.1 ohms plus or -10%

Question 20

Colour band

Answer 20

The first digit together with the second did it multiplied by the third plus the percent of the fourth