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Electronic Certification > Voltage, Current and Resistance (chap 2) > Flashcards

Voltage, Current and Resistance (chap 2) Flashcards

1
Q

what instrument is used to measure current

A

Ammeter

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2
Q

the unit of electrical current

A

Ampere (A)

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3
Q

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

A

Atom

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4
Q

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

A

Charge

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5
Q

what symbol represents charge

A

Q

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6
Q

the unit of electrical charge is expressed in

A

Coulomb (C)

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7
Q

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

A

Circuit

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8
Q

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

A

Circuit Breaker

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9
Q

what is a circuit with a complete path

A

Closed Circuit

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10
Q

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

A

Conductance (G)

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11
Q

copper is an example of a ?

A

Conductor

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12
Q

the rate of flow of charge

A

Current

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13
Q

what is DMM

A

Digital multi-meter

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14
Q

this particle is negatively charged

A

Electrons

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15
Q

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

A

Free electron

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16
Q

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

A

Fuel cell

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17
Q

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

A

Fuse

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18
Q

the common or reference point in a circuit

A

Ground

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19
Q

a material that does not allow current under normal conditions

A

Insulator

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20
Q

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

A

Load

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21
Q

the unit of resistance

A

Ohm

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22
Q

what instrument is used to measure resistance

A

Ohmmeter

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23
Q

a circuit in which there is not a complete patch

A

Open Circuit

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24
Q

a three terminal variable resistor used to control voltage

A

Potentiometer

25
Q

what is the opposition to current

A

Resistance

26
Q

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

A

Resistor

27
Q

a two terminal variable resistor used to control current

A

Rheostat

28
Q

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

A

Semiconductor

29
Q

what unit is conductance

A

Siemens (S)

30
Q

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

A

Switch

31
Q

what unit is voltage or electromotive force

A

Volt (V)

32
Q

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

A

Voltage

33
Q

what device produces a constant voltage for a varying load

A

Voltage source

34
Q

what is used to measure voltage

A

Voltmeter

35
Q

what particles are found in the nucleus

A

electrons
protons
neutrons

36
Q

what are the three materials used in electrons

A

conductors
semiconductors
insulators

37
Q

what is a atom with a net positive charge

A

positive ion

38
Q

what is a atom with a negative charge

A

negative ion

39
Q

name 7 dc voltage source

A 
batteries
fuel cells
solar cells
generators
power supply
thermocouples 
piezoelectric sensors
40
Q

convert chemical energy directly into electrical energy

A

batteries

41
Q

converts light energy directly into electrical energy

A

solar cells

42
Q

converts mechanical energy into electrical energy

A

generators

43
Q

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

A

the power supply

44
Q

this thermoelectric dc voltage source is used to sense temperature

A

thermocouple

45
Q

what is the formula for Conductance (G)

A

G = 1/R

46
Q

what are the two type of resistors

A

fixed

variable

47
Q

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

A

fixed resistor

48
Q

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

A

variable resistors

49
Q

resistors color code number for (black)

A

0

50
Q

resistors color code number for (brown)

A

1

51
Q

resistors color code number for (red)

A

2

52
Q

resistors color code number for (orange)

A

3

53
Q

resistors color code number for (yellow)

A

4

54
Q

resistors color code number for (green)

A

5

55
Q

resistors color code number for (blue)

A

6

56
Q

resistors color code number for (violet)

A

7

57
Q

resistors color code number for (grey)

A

8

58
Q

resistors color code number for (white)

A

9

Electronic Certification (1 decks)

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