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SI Units Flashcards: 7 Base Units & 22 Named Derived Units

Practice all 7 SI base units and 22 derived units with special names: quantities, symbols, and base-unit expressions in one installable deck.

By author Open Study Contributor

About this deck

Most SI lists are easy to scan and awkward to recall. These 110 text-only cards turn the complete core into small retrieval tasks: all seven base units and all 22 derived units with special names and symbols.

What the cards practice

  • Quantity ↔ unit and symbol: recall each base quantity and every named derived quantity in both directions.

  • Named unit ↔ coherent base-unit expression: expand all 22 special names, then reverse the mapping with the quantity supplied whenever an expression is shared.

  • Notation and distinctions: keep case, spacing, symbol grammar, Hz/Bq, Gy/Sv, rad/sr, and kelvin/degree Celsius intervals straight.

The deck leaves out prefixes, conversions, non-SI units, unnamed derived units, significant figures, uncertainty, laboratory procedures, historical definitions, defining-constant values, and proprietary exam material. Expression-to-unit prompts always state the quantity, so shared expressions such as s⁻¹ and m²·s⁻² stay unambiguous.

The sequence establishes the seven base units first. It then alternates the 22 named units with a deterministic stride before moving from identity recall to base-unit expressions. Related directions and easy-to-confuse units stay at least three unrelated cards apart; the review scheduler handles longer-term spacing after installation.

Facts were checked against the BIPM SI Brochure, 9th edition, version 4.01 and NIST SP 330 §2, with notation checked against NIST SP 330 §5. The 2026 BIPM edition expresses radian and steradian as unit one; this deck follows that current form. No source prose, third-party deck text, or exam content was copied.

An AI tool helped draft and sequence the cards and generated the cover. Every final front and back was manually checked against the official SI tables. The original questions, answers, selection, sequence, metadata, and cover are shared under CC0 1.0 to the extent those elements can be dedicated; the underlying SI facts remain common knowledge.

Cards in this deck

  1. Card 1

    Question

    What is the SI base unit for time?

    Answer

    second (s).

  2. Card 2

    Question

    What is the SI base unit for length?

    Answer

    metre (m).

  3. Card 3

    Question

    What is the SI base unit for mass?

    Answer

    kilogram (kg).

  4. Card 4

    Question

    What is the SI base unit for electric current?

    Answer

    ampere (A).

  5. Card 5

    Question

    What is the SI base unit for thermodynamic temperature?

    Answer

    kelvin (K).

  6. Card 6

    Question

    What is the SI base unit for amount of substance?

    Answer

    mole (mol).

  7. Card 7

    Question

    What is the SI base unit for luminous intensity?

    Answer

    candela (cd).

  8. Card 8

    Question

    Which SI base quantity uses the second (s)?

    Answer

    Time.

  9. Card 9

    Question

    Which SI base quantity uses the metre (m)?

    Answer

    Length.

  10. Card 10

    Question

    Which SI base quantity uses the kilogram (kg)?

    Answer

    Mass.

  11. Card 11

    Question

    Which SI base quantity uses the ampere (A)?

    Answer

    Electric current.

  12. Card 12

    Question

    Which SI base quantity uses the kelvin (K)?

    Answer

    Thermodynamic temperature.

  13. Card 13

    Question

    Which SI base quantity uses the mole (mol)?

    Answer

    Amount of substance.

  14. Card 14

    Question

    Which SI base quantity uses the candela (cd)?

    Answer

    Luminous intensity.

  15. Card 15

    Question

    Which SI unit with a special name is used for plane angle?

    Answer

    radian (rad).

  16. Card 16

    Question

    Which SI unit with a special name is used for energy, work, or amount of heat?

    Answer

    joule (J).

  17. Card 17

    Question

    Which SI unit with a special name is used for electric resistance?

    Answer

    ohm (Ω).

  18. Card 18

    Question

    Which SI unit with a special name is used for Celsius temperature?

    Answer

    degree Celsius (°C).

  19. Card 19

    Question

    Which SI unit with a special name is used for dose equivalent?

    Answer

    sievert (Sv).

  20. Card 20

    Question

    Which SI unit with a special name is used for force?

    Answer

    newton (N).

  21. Card 21

    Question

    Which SI unit with a special name is used for electric potential difference?

    Answer

    volt (V).

  22. Card 22

    Question

    Which SI unit with a special name is used for magnetic flux density?

    Answer

    tesla (T).

  23. Card 23

    Question

    Which SI unit with a special name is used for activity referred to a radionuclide?

    Answer

    becquerel (Bq).

  24. Card 24

    Question

    Which SI unit with a special name is used for solid angle?

    Answer

    steradian (sr).

  25. Card 25

    Question

    Which SI unit with a special name is used for power or radiant flux?

    Answer

    watt (W).

  26. Card 26

    Question

    Which SI unit with a special name is used for electric conductance?

    Answer

    siemens (S).

  27. Card 27

    Question

    Which SI unit with a special name is used for luminous flux?

    Answer

    lumen (lm).

  28. Card 28

    Question

    Which SI unit with a special name is used for catalytic activity?

    Answer

    katal (kat).

  29. Card 29

    Question

    Which SI unit with a special name is used for pressure or stress?

    Answer

    pascal (Pa).

  30. Card 30

    Question

    Which SI unit with a special name is used for capacitance?

    Answer

    farad (F).

  31. Card 31

    Question

    Which SI unit with a special name is used for inductance?

    Answer

    henry (H).

  32. Card 32

    Question

    Which SI unit with a special name is used for absorbed dose or kerma?

    Answer

    gray (Gy).

  33. Card 33

    Question

    Which SI unit with a special name is used for frequency?

    Answer

    hertz (Hz).

  34. Card 34

    Question

    Which SI unit with a special name is used for electric charge?

    Answer

    coulomb (C).

  35. Card 35

    Question

    Which SI unit with a special name is used for magnetic flux?

    Answer

    weber (Wb).

  36. Card 36

    Question

    Which SI unit with a special name is used for illuminance?

    Answer

    lux (lx).

  37. Card 37

    Question

    What quantity uses the radian (rad)?

    Answer

    Plane angle.

  38. Card 38

    Question

    What quantity uses the joule (J)?

    Answer

    Energy, work, and amount of heat.

  39. Card 39

    Question

    What quantity uses the ohm (Ω)?

    Answer

    Electric resistance.

  40. Card 40

    Question

    What quantity uses the degree Celsius (°C)?

    Answer

    Celsius temperature.

  41. Card 41

    Question

    What quantity uses the sievert (Sv)?

    Answer

    Dose equivalent.

  42. Card 42

    Question

    What quantity uses the newton (N)?

    Answer

    Force.

  43. Card 43

    Question

    What quantity uses the volt (V)?

    Answer

    Electric potential difference.

  44. Card 44

    Question

    What quantity uses the tesla (T)?

    Answer

    Magnetic flux density.

  45. Card 45

    Question

    What quantity uses the becquerel (Bq)?

    Answer

    Activity referred to a radionuclide.

  46. Card 46

    Question

    What quantity uses the steradian (sr)?

    Answer

    Solid angle.

  47. Card 47

    Question

    What quantity uses the watt (W)?

    Answer

    Power and radiant flux.

  48. Card 48

    Question

    What quantity uses the siemens (S)?

    Answer

    Electric conductance.

  49. Card 49

    Question

    What quantity uses the lumen (lm)?

    Answer

    Luminous flux.

  50. Card 50

    Question

    What quantity uses the katal (kat)?

    Answer

    Catalytic activity.

  51. Card 51

    Question

    What quantity uses the pascal (Pa)?

    Answer

    Pressure and stress.

  52. Card 52

    Question

    What quantity uses the farad (F)?

    Answer

    Capacitance.

  53. Card 53

    Question

    What quantity uses the henry (H)?

    Answer

    Inductance.

  54. Card 54

    Question

    What quantity uses the gray (Gy)?

    Answer

    Absorbed dose and kerma.

  55. Card 55

    Question

    What quantity uses the hertz (Hz)?

    Answer

    Frequency.

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    SI Units Flashcards: 7 Base Units & 22 Named Derived Units

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  56. Card 56

    Question

    What quantity uses the coulomb (C)?

    Answer

    Electric charge.

  57. Card 57

    Question

    What quantity uses the weber (Wb)?

    Answer

    Magnetic flux.

  58. Card 58

    Question

    What quantity uses the lux (lx)?

    Answer

    Illuminance.

  59. Card 59

    Question

    Express the radian (rad) in coherent SI base units.

    Answer

    1. The symbol rad keeps the plane-angle context explicit.

  60. Card 60

    Question

    Express the joule (J) in coherent SI base units.

    Answer

    kg·m²·s⁻².

  61. Card 61

    Question

    Express the ohm (Ω) in coherent SI base units.

    Answer

    kg·m²·s⁻³·A⁻².

  62. Card 62

    Question

    Express the degree Celsius (°C) in coherent SI base units.

    Answer

    K. A degree Celsius and a kelvin have the same size; their zero points differ.

  63. Card 63

    Question

    Express the sievert (Sv) in coherent SI base units.

    Answer

    m²·s⁻².

  64. Card 64

    Question

    Express the newton (N) in coherent SI base units.

    Answer

    kg·m·s⁻².

  65. Card 65

    Question

    Express the volt (V) in coherent SI base units.

    Answer

    kg·m²·s⁻³·A⁻¹.

  66. Card 66

    Question

    Express the tesla (T) in coherent SI base units.

    Answer

    kg·s⁻²·A⁻¹.

  67. Card 67

    Question

    Express the becquerel (Bq) in coherent SI base units.

    Answer

    s⁻¹. Use Bq for stochastic nuclear transformations, not periodic phenomena.

  68. Card 68

    Question

    Express the steradian (sr) in coherent SI base units.

    Answer

    1. The symbol sr keeps the solid-angle context explicit.

  69. Card 69

    Question

    Express the watt (W) in coherent SI base units.

    Answer

    kg·m²·s⁻³.

  70. Card 70

    Question

    Express the siemens (S) in coherent SI base units.

    Answer

    kg⁻¹·m⁻²·s³·A².

  71. Card 71

    Question

    Express the lumen (lm) in coherent SI base units.

    Answer

    cd·sr. Since sr has unit one, this is dimensionally cd; sr keeps the solid-angle context explicit.

  72. Card 72

    Question

    Express the katal (kat) in coherent SI base units.

    Answer

    mol·s⁻¹.

  73. Card 73

    Question

    Express the pascal (Pa) in coherent SI base units.

    Answer

    kg·m⁻¹·s⁻².

  74. Card 74

    Question

    Express the farad (F) in coherent SI base units.

    Answer

    kg⁻¹·m⁻²·s⁴·A².

  75. Card 75

    Question

    Express the henry (H) in coherent SI base units.

    Answer

    kg·m²·s⁻²·A⁻².

  76. Card 76

    Question

    Express the gray (Gy) in coherent SI base units.

    Answer

    m²·s⁻².

  77. Card 77

    Question

    Express the hertz (Hz) in coherent SI base units.

    Answer

    s⁻¹. Use Hz for periodic phenomena.

  78. Card 78

    Question

    Express the coulomb (C) in coherent SI base units.

    Answer

    A·s.

  79. Card 79

    Question

    Express the weber (Wb) in coherent SI base units.

    Answer

    kg·m²·s⁻²·A⁻¹.

  80. Card 80

    Question

    Express the lux (lx) in coherent SI base units.

    Answer

    cd·sr·m⁻². Since sr has unit one, this is dimensionally cd·m⁻²; sr keeps the solid-angle context explicit.

  81. Card 81

    Question

    For plane angle, which named SI unit has the coherent base-unit expression 1?

    Answer

    radian (rad).

  82. Card 82

    Question

    For energy, work, or amount of heat, which named SI unit has the coherent base-unit expression kg·m²·s⁻²?

    Answer

    joule (J).

  83. Card 83

    Question

    For electric resistance, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻²?

    Answer

    ohm (Ω).

  84. Card 84

    Question

    For Celsius temperature, which named SI unit has the coherent base-unit expression K?

    Answer

    degree Celsius (°C).

  85. Card 85

    Question

    For dose equivalent, which named SI unit has the coherent base-unit expression m²·s⁻²?

    Answer

    sievert (Sv).

  86. Card 86

    Question

    For force, which named SI unit has the coherent base-unit expression kg·m·s⁻²?

    Answer

    newton (N).

  87. Card 87

    Question

    For electric potential difference, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻¹?

    Answer

    volt (V).

  88. Card 88

    Question

    For magnetic flux density, which named SI unit has the coherent base-unit expression kg·s⁻²·A⁻¹?

    Answer

    tesla (T).

  89. Card 89

    Question

    For activity referred to a radionuclide, which named SI unit has the coherent base-unit expression s⁻¹?

    Answer

    becquerel (Bq).

  90. Card 90

    Question

    For solid angle, which named SI unit has the coherent base-unit expression 1?

    Answer

    steradian (sr).

  91. Card 91

    Question

    For power or radiant flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻³?

    Answer

    watt (W).

  92. Card 92

    Question

    For electric conductance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s³·A²?

    Answer

    siemens (S).

  93. Card 93

    Question

    For luminous flux, which named SI unit has the coherent base-unit expression cd·sr?

    Answer

    lumen (lm).

  94. Card 94

    Question

    For catalytic activity, which named SI unit has the coherent base-unit expression mol·s⁻¹?

    Answer

    katal (kat).

  95. Card 95

    Question

    For pressure or stress, which named SI unit has the coherent base-unit expression kg·m⁻¹·s⁻²?

    Answer

    pascal (Pa).

  96. Card 96

    Question

    For capacitance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s⁴·A²?

    Answer

    farad (F).

  97. Card 97

    Question

    For inductance, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻²?

    Answer

    henry (H).

  98. Card 98

    Question

    For absorbed dose or kerma, which named SI unit has the coherent base-unit expression m²·s⁻²?

    Answer

    gray (Gy).

  99. Card 99

    Question

    For frequency, which named SI unit has the coherent base-unit expression s⁻¹?

    Answer

    hertz (Hz).

  100. Card 100

    Question

    For electric charge, which named SI unit has the coherent base-unit expression A·s?

    Answer

    coulomb (C).

  101. Card 101

    Question

    For magnetic flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻¹?

    Answer

    weber (Wb).

  102. Card 102

    Question

    For illuminance, which named SI unit has the coherent base-unit expression cd·sr·m⁻²?

    Answer

    lux (lx).

  103. Card 103

    Question

    How are SI unit names capitalized in English?

    Answer

    They normally start with a lowercase letter, even when named after a person. Within this deck, the proper-name modifier in degree Celsius keeps its capital C.

  104. Card 104

    Question

    What determines capitalization in an SI unit symbol?

    Answer

    Symbols derived from proper names start with a capital letter; the others are lowercase. Case is mandatory and meaningful.

  105. Card 105

    Question

    How do SI unit symbols behave in plurals and at sentence endings?

    Answer

    They never take a plural ending, and they take no period unless the symbol ends a sentence. Unit symbols are mathematical symbols, not abbreviations.

  106. Card 106

    Question

    How should a number and an SI unit symbol be spaced?

    Answer

    Put a space between them: 25 m and 20 °C. In °C, the degree sign and C stay together.

  107. Card 107

    Question

    Both hertz and becquerel reduce to s⁻¹. When is each used?

    Answer

    Use hertz (Hz) for periodic phenomena and becquerel (Bq) for activity referred to a radionuclide. The shared expression doesn't make the quantities interchangeable.

  108. Card 108

    Question

    Both gray and sievert reduce to m²·s⁻². What distinguishes them?

    Answer

    Gray (Gy) is used for absorbed dose or kerma; sievert (Sv) is used for dose equivalent. The quantity context determines the special name.

  109. Card 109

    Question

    Radian and steradian both have coherent unit expression 1. What distinguishes them?

    Answer

    Radian (rad) is used for plane angle; steradian (sr) is used for solid angle. Their symbols preserve the quantity context.

  110. Card 110

    Question

    For temperature intervals, how do kelvin and degrees Celsius compare?

    Answer

    A change of 1 K equals a change of 1 °C. Their zero points differ, so absolute temperatures aren't numerically equal.

Abstract glowing measurement forms connected in a geometric system on a dark blue background.

110 cards

SI Units Flashcards: 7 Base Units & 22 Named Derived Units

Study this deck for free

Flashcards opens so you can start studying.