Introduction to Electrical Devices

Question 1

Circuits are analyzed according to 4 characteristics in a circuit. What are they?

Answer 1

Current
Resistance
Voltage
Power

Question 2

What are Component Diagrams used for?

Answer 2

Show the physical relationship between components or to show components of a circuit when the reader might not be familiar with those components.

Question 3

Component diagrams are also called ?

Answer 3

Pictorial Diagrams

Question 4

What are the two general types of resistors?

Answer 4

Fixed

Variable

Question 5

What is a fixed resistor?

Answer 5

Resistor that has a value that is set and not adjustable

Question 6

What is a variable resistor?

Answer 6

A resistor that can have its value changed

Question 7

There are 4 important numbers associated with any type of resistor, what are they?

Answer 7

Resistance Value
Power Rating
Tolerance
Reliability

Question 8

What is the Power Rating of a Resistor stating?

Answer 8

Amount of Power that can be dissipated by the resistor without damaging the resistor or affecting its operation

Question 9

The Tolerance of resistor is affected by ?

Answer 9

Variation in building materials

Question 10

Name 4 types of fixed Resistors

Answer 10

Composition Carbon
Metal Film
Metal Glaze
Wire-Wound Resistor

Question 11

Most common type of fixed resistor?

Answer 11

Composition Carbon Resistor

Question 12

Fixed Resistors have a color code to ?

Answer 12

Indicate the value of the resistor.

Question 13

What are the two common color band configurations for fixed resistors?

Answer 13

4 band configuration

5 band configuration

Question 14

The lower the percentage tolerance in a resistor…..

Answer 14

The more precise the resistor value and the higher the cost

Question 15

In a 4 band color code what is the purpose of each band?

Answer 15

1- first digit
2- second digit
3- multiplier
4- Tolerance
5- Reliability

Question 16

In a 5 band color code what is the purpose of each band?

Answer 16

1- first digit
2-second digit
3-third digit
4-Multiplier
5-Tolerance

Question 17

Wire-Wound resistors are best for

Answer 17

applications requiring high temperature and high power

Question 18

Another term for variable resistor is ?

Answer 18

Potentiometer

Question 19

What is a Potentiometer?

Answer 19

A variable resistor with three terminals. Used to Adjust the applied voltage.

Question 20

What is a rheostat?

Answer 20

A variable resistor with 2 terminals. Strictly used to vary the amount of current that flows to a circuit.

Question 21

A Potentiometer can be used as a Rheostat?

Answer 21

Yes because it has three terminals, one more additional, than a rheostat. Must use two of the three terminals.