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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.

Par Open Study Contributor

À propos de ce paquet

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.

Cartes de ce paquet

  1. Carte 1

    Question

    What is the SI base unit for time?

    Réponse

    second (s).

  2. Carte 2

    Question

    What is the SI base unit for length?

    Réponse

    metre (m).

  3. Carte 3

    Question

    What is the SI base unit for mass?

    Réponse

    kilogram (kg).

  4. Carte 4

    Question

    What is the SI base unit for electric current?

    Réponse

    ampere (A).

  5. Carte 5

    Question

    What is the SI base unit for thermodynamic temperature?

    Réponse

    kelvin (K).

  6. Carte 6

    Question

    What is the SI base unit for amount of substance?

    Réponse

    mole (mol).

  7. Carte 7

    Question

    What is the SI base unit for luminous intensity?

    Réponse

    candela (cd).

  8. Carte 8

    Question

    Which SI base quantity uses the second (s)?

    Réponse

    Time.

  9. Carte 9

    Question

    Which SI base quantity uses the metre (m)?

    Réponse

    Length.

  10. Carte 10

    Question

    Which SI base quantity uses the kilogram (kg)?

    Réponse

    Mass.

  11. Carte 11

    Question

    Which SI base quantity uses the ampere (A)?

    Réponse

    Electric current.

  12. Carte 12

    Question

    Which SI base quantity uses the kelvin (K)?

    Réponse

    Thermodynamic temperature.

  13. Carte 13

    Question

    Which SI base quantity uses the mole (mol)?

    Réponse

    Amount of substance.

  14. Carte 14

    Question

    Which SI base quantity uses the candela (cd)?

    Réponse

    Luminous intensity.

  15. Carte 15

    Question

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

    Réponse

    radian (rad).

  16. Carte 16

    Question

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

    Réponse

    joule (J).

  17. Carte 17

    Question

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

    Réponse

    ohm (Ω).

  18. Carte 18

    Question

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

    Réponse

    degree Celsius (°C).

  19. Carte 19

    Question

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

    Réponse

    sievert (Sv).

  20. Carte 20

    Question

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

    Réponse

    newton (N).

  21. Carte 21

    Question

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

    Réponse

    volt (V).

  22. Carte 22

    Question

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

    Réponse

    tesla (T).

  23. Carte 23

    Question

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

    Réponse

    becquerel (Bq).

  24. Carte 24

    Question

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

    Réponse

    steradian (sr).

  25. Carte 25

    Question

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

    Réponse

    watt (W).

  26. Carte 26

    Question

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

    Réponse

    siemens (S).

  27. Carte 27

    Question

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

    Réponse

    lumen (lm).

  28. Carte 28

    Question

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

    Réponse

    katal (kat).

  29. Carte 29

    Question

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

    Réponse

    pascal (Pa).

  30. Carte 30

    Question

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

    Réponse

    farad (F).

  31. Carte 31

    Question

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

    Réponse

    henry (H).

  32. Carte 32

    Question

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

    Réponse

    gray (Gy).

  33. Carte 33

    Question

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

    Réponse

    hertz (Hz).

  34. Carte 34

    Question

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

    Réponse

    coulomb (C).

  35. Carte 35

    Question

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

    Réponse

    weber (Wb).

  36. Carte 36

    Question

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

    Réponse

    lux (lx).

  37. Carte 37

    Question

    What quantity uses the radian (rad)?

    Réponse

    Plane angle.

  38. Carte 38

    Question

    What quantity uses the joule (J)?

    Réponse

    Energy, work, and amount of heat.

  39. Carte 39

    Question

    What quantity uses the ohm (Ω)?

    Réponse

    Electric resistance.

  40. Carte 40

    Question

    What quantity uses the degree Celsius (°C)?

    Réponse

    Celsius temperature.

  41. Carte 41

    Question

    What quantity uses the sievert (Sv)?

    Réponse

    Dose equivalent.

  42. Carte 42

    Question

    What quantity uses the newton (N)?

    Réponse

    Force.

  43. Carte 43

    Question

    What quantity uses the volt (V)?

    Réponse

    Electric potential difference.

  44. Carte 44

    Question

    What quantity uses the tesla (T)?

    Réponse

    Magnetic flux density.

  45. Carte 45

    Question

    What quantity uses the becquerel (Bq)?

    Réponse

    Activity referred to a radionuclide.

  46. Carte 46

    Question

    What quantity uses the steradian (sr)?

    Réponse

    Solid angle.

  47. Carte 47

    Question

    What quantity uses the watt (W)?

    Réponse

    Power and radiant flux.

  48. Carte 48

    Question

    What quantity uses the siemens (S)?

    Réponse

    Electric conductance.

  49. Carte 49

    Question

    What quantity uses the lumen (lm)?

    Réponse

    Luminous flux.

  50. Carte 50

    Question

    What quantity uses the katal (kat)?

    Réponse

    Catalytic activity.

  51. Carte 51

    Question

    What quantity uses the pascal (Pa)?

    Réponse

    Pressure and stress.

  52. Carte 52

    Question

    What quantity uses the farad (F)?

    Réponse

    Capacitance.

  53. Carte 53

    Question

    What quantity uses the henry (H)?

    Réponse

    Inductance.

  54. Carte 54

    Question

    What quantity uses the gray (Gy)?

    Réponse

    Absorbed dose and kerma.

  55. Carte 55

    Question

    What quantity uses the hertz (Hz)?

    Réponse

    Frequency.

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

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  56. Carte 56

    Question

    What quantity uses the coulomb (C)?

    Réponse

    Electric charge.

  57. Carte 57

    Question

    What quantity uses the weber (Wb)?

    Réponse

    Magnetic flux.

  58. Carte 58

    Question

    What quantity uses the lux (lx)?

    Réponse

    Illuminance.

  59. Carte 59

    Question

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

    Réponse

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

  60. Carte 60

    Question

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

    Réponse

    kg·m²·s⁻².

  61. Carte 61

    Question

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

    Réponse

    kg·m²·s⁻³·A⁻².

  62. Carte 62

    Question

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

    Réponse

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

  63. Carte 63

    Question

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

    Réponse

    m²·s⁻².

  64. Carte 64

    Question

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

    Réponse

    kg·m·s⁻².

  65. Carte 65

    Question

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

    Réponse

    kg·m²·s⁻³·A⁻¹.

  66. Carte 66

    Question

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

    Réponse

    kg·s⁻²·A⁻¹.

  67. Carte 67

    Question

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

    Réponse

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

  68. Carte 68

    Question

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

    Réponse

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

  69. Carte 69

    Question

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

    Réponse

    kg·m²·s⁻³.

  70. Carte 70

    Question

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

    Réponse

    kg⁻¹·m⁻²·s³·A².

  71. Carte 71

    Question

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

    Réponse

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

  72. Carte 72

    Question

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

    Réponse

    mol·s⁻¹.

  73. Carte 73

    Question

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

    Réponse

    kg·m⁻¹·s⁻².

  74. Carte 74

    Question

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

    Réponse

    kg⁻¹·m⁻²·s⁴·A².

  75. Carte 75

    Question

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

    Réponse

    kg·m²·s⁻²·A⁻².

  76. Carte 76

    Question

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

    Réponse

    m²·s⁻².

  77. Carte 77

    Question

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

    Réponse

    s⁻¹. Use Hz for periodic phenomena.

  78. Carte 78

    Question

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

    Réponse

    A·s.

  79. Carte 79

    Question

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

    Réponse

    kg·m²·s⁻²·A⁻¹.

  80. Carte 80

    Question

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

    Réponse

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

  81. Carte 81

    Question

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

    Réponse

    radian (rad).

  82. Carte 82

    Question

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

    Réponse

    joule (J).

  83. Carte 83

    Question

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

    Réponse

    ohm (Ω).

  84. Carte 84

    Question

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

    Réponse

    degree Celsius (°C).

  85. Carte 85

    Question

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

    Réponse

    sievert (Sv).

  86. Carte 86

    Question

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

    Réponse

    newton (N).

  87. Carte 87

    Question

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

    Réponse

    volt (V).

  88. Carte 88

    Question

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

    Réponse

    tesla (T).

  89. Carte 89

    Question

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

    Réponse

    becquerel (Bq).

  90. Carte 90

    Question

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

    Réponse

    steradian (sr).

  91. Carte 91

    Question

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

    Réponse

    watt (W).

  92. Carte 92

    Question

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

    Réponse

    siemens (S).

  93. Carte 93

    Question

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

    Réponse

    lumen (lm).

  94. Carte 94

    Question

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

    Réponse

    katal (kat).

  95. Carte 95

    Question

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

    Réponse

    pascal (Pa).

  96. Carte 96

    Question

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

    Réponse

    farad (F).

  97. Carte 97

    Question

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

    Réponse

    henry (H).

  98. Carte 98

    Question

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

    Réponse

    gray (Gy).

  99. Carte 99

    Question

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

    Réponse

    hertz (Hz).

  100. Carte 100

    Question

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

    Réponse

    coulomb (C).

  101. Carte 101

    Question

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

    Réponse

    weber (Wb).

  102. Carte 102

    Question

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

    Réponse

    lux (lx).

  103. Carte 103

    Question

    How are SI unit names capitalized in English?

    Réponse

    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. Carte 104

    Question

    What determines capitalization in an SI unit symbol?

    Réponse

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

  105. Carte 105

    Question

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

    Réponse

    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. Carte 106

    Question

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

    Réponse

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

  107. Carte 107

    Question

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

    Réponse

    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. Carte 108

    Question

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

    Réponse

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

  109. Carte 109

    Question

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

    Réponse

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

  110. Carte 110

    Question

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

    Réponse

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

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110 cartes

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

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