Voltage, Current and Resistance (chap 2)

Question 1

what instrument is used to measure current

Answer 1

Ammeter

Question 2

the unit of electrical current

Answer 2

Ampere (A)

Question 3

the smallest particle of an element possessing the unique characteristics of that element

Answer 3

Atom

Question 4

what is an electrical property of matter that exists because of an excess or deficiency of electrons

Answer 4

Charge

Question 5

what symbol represents charge

Answer 5

Q

Question 6

the unit of electrical charge is expressed in

Answer 6

Coulomb (C)

Question 7

what is an interconnection of electrical components designed to produce a desired result

Answer 7

Circuit

Question 8

what is a resettable protective device used for interrupting excessive current in an electric circuit

Answer 8

Circuit Breaker

Question 9

what is a circuit with a complete path

Answer 9

Closed Circuit

Question 10

what is the ability of a circuit to allow current to flow

Answer 10

Conductance (G)

Question 11

copper is an example of a ?

Answer 11

Conductor

Question 12

the rate of flow of charge

Answer 12

Current

Question 13

what is DMM

Answer 13

Digital multi-meter

Question 14

this particle is negatively charged

Answer 14

Electrons

Question 15

what is a valence electron that has broken away from its parent atom and is free to move from atom to atom within the atomic structure of a material

Answer 15

Free electron

Question 16

this type of dc voltage source converts electrochemical energy from an external source into dc voltage

Answer 16

Fuel cell

Question 17

what is a protective device that burns open when there is excessive current in a circuit

Answer 17

Fuse

Question 18

the common or reference point in a circuit

Answer 18

Ground

Question 19

a material that does not allow current under normal conditions

Answer 19

Insulator

Question 20

what is an element (resistor or other component) connected across the output terminals of a circuit that draws current from that sources and upon which work is done

Answer 20

Load

Question 21

the unit of resistance

Answer 21

Ohm

Question 22

what instrument is used to measure resistance

Answer 22

Ohmmeter

Question 23

a circuit in which there is not a complete patch

Answer 23

Open Circuit

Question 24

a three terminal variable resistor used to control voltage

Answer 24

Potentiometer

Question 25

what is the opposition to current

Answer 25

Resistance

Question 26

an electrical component designed specifically to have a certain amount of resistance

Answer 26

Resistor

Question 27

a two terminal variable resistor used to control current

Answer 27

Rheostat

Question 28

a material that has conductance value between that of a conductor and a insulator

Answer 28

Semiconductor

Question 29

what unit is conductance

Answer 29

Siemens (S)

Question 30

an electrical or electronic device for opening and closing a current path

Answer 30

Switch

Question 31

what unit is voltage or electromotive force

Answer 31

Volt (V)

Question 32

what is the amount of energy per charge available to move electrons from one point to another in an electric circuit

Answer 32

Voltage

Question 33

what device produces a constant voltage for a varying load

Answer 33

Voltage source

Question 34

what is used to measure voltage

Answer 34

Voltmeter

Question 35

what particles are found in the nucleus

Answer 35

electrons protons neutrons

Question 36

what are the three materials used in electrons

Answer 36

conductors semiconductors insulators

Question 37

what is a atom with a net positive charge

Answer 37

positive ion

Question 38

what is a atom with a negative charge

Answer 38

negative ion

Question 39

name 7 dc voltage source

Answer 39

``` batteries fuel cells solar cells generators power supply thermocouples piezoelectric sensors ```

Question 40

convert chemical energy directly into electrical energy

Answer 40

batteries

Question 41

converts light energy directly into electrical energy

Answer 41

solar cells

Question 42

converts mechanical energy into electrical energy

Answer 42

generators

Question 43

convers ac voltage from the wall outlet into a constant dc voltage

Answer 43

the power supply

Question 44

this thermoelectric dc voltage source is used to sense temperature

Answer 44

thermocouple

Question 45

what is the formula for Conductance (G)

Answer 45

G = 1/R

Question 46

what are the two type of resistors

Answer 46

fixed | variable

Question 47

this type of resistor is available with a large selector of resistance value that are set during manufacturing

Answer 47

fixed resistor

Question 48

this type of resistor are designed so that their resistance can be changed

Answer 48

variable resistors

Question 49

resistors color code number for (black)

Answer 49

0

Question 50

resistors color code number for (brown)

Answer 50

1

Question 51

resistors color code number for (red)

Answer 51

2

Question 52

resistors color code number for (orange)

Answer 52

3

Question 53

resistors color code number for (yellow)

Answer 53

4

Question 54

resistors color code number for (green)

Answer 54

5

Question 55

resistors color code number for (blue)

Answer 55

6

Question 56

resistors color code number for (violet)

Answer 56

7

Question 57

resistors color code number for (grey)

Answer 57

8

Question 58

resistors color code number for (white)

Answer 58

9