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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.

Autorius Open Study Contributor

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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.

Šio rinkinio kortelės

  1. 1 kortelė

    Klausimas

    What is the SI base unit for time?

    Atsakymas

    second (s).

  2. 2 kortelė

    Klausimas

    What is the SI base unit for length?

    Atsakymas

    metre (m).

  3. 3 kortelė

    Klausimas

    What is the SI base unit for mass?

    Atsakymas

    kilogram (kg).

  4. 4 kortelė

    Klausimas

    What is the SI base unit for electric current?

    Atsakymas

    ampere (A).

  5. 5 kortelė

    Klausimas

    What is the SI base unit for thermodynamic temperature?

    Atsakymas

    kelvin (K).

  6. 6 kortelė

    Klausimas

    What is the SI base unit for amount of substance?

    Atsakymas

    mole (mol).

  7. 7 kortelė

    Klausimas

    What is the SI base unit for luminous intensity?

    Atsakymas

    candela (cd).

  8. 8 kortelė

    Klausimas

    Which SI base quantity uses the second (s)?

    Atsakymas

    Time.

  9. 9 kortelė

    Klausimas

    Which SI base quantity uses the metre (m)?

    Atsakymas

    Length.

  10. 10 kortelė

    Klausimas

    Which SI base quantity uses the kilogram (kg)?

    Atsakymas

    Mass.

  11. 11 kortelė

    Klausimas

    Which SI base quantity uses the ampere (A)?

    Atsakymas

    Electric current.

  12. 12 kortelė

    Klausimas

    Which SI base quantity uses the kelvin (K)?

    Atsakymas

    Thermodynamic temperature.

  13. 13 kortelė

    Klausimas

    Which SI base quantity uses the mole (mol)?

    Atsakymas

    Amount of substance.

  14. 14 kortelė

    Klausimas

    Which SI base quantity uses the candela (cd)?

    Atsakymas

    Luminous intensity.

  15. 15 kortelė

    Klausimas

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

    Atsakymas

    radian (rad).

  16. 16 kortelė

    Klausimas

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

    Atsakymas

    joule (J).

  17. 17 kortelė

    Klausimas

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

    Atsakymas

    ohm (Ω).

  18. 18 kortelė

    Klausimas

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

    Atsakymas

    degree Celsius (°C).

  19. 19 kortelė

    Klausimas

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

    Atsakymas

    sievert (Sv).

  20. 20 kortelė

    Klausimas

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

    Atsakymas

    newton (N).

  21. 21 kortelė

    Klausimas

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

    Atsakymas

    volt (V).

  22. 22 kortelė

    Klausimas

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

    Atsakymas

    tesla (T).

  23. 23 kortelė

    Klausimas

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

    Atsakymas

    becquerel (Bq).

  24. 24 kortelė

    Klausimas

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

    Atsakymas

    steradian (sr).

  25. 25 kortelė

    Klausimas

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

    Atsakymas

    watt (W).

  26. 26 kortelė

    Klausimas

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

    Atsakymas

    siemens (S).

  27. 27 kortelė

    Klausimas

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

    Atsakymas

    lumen (lm).

  28. 28 kortelė

    Klausimas

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

    Atsakymas

    katal (kat).

  29. 29 kortelė

    Klausimas

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

    Atsakymas

    pascal (Pa).

  30. 30 kortelė

    Klausimas

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

    Atsakymas

    farad (F).

  31. 31 kortelė

    Klausimas

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

    Atsakymas

    henry (H).

  32. 32 kortelė

    Klausimas

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

    Atsakymas

    gray (Gy).

  33. 33 kortelė

    Klausimas

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

    Atsakymas

    hertz (Hz).

  34. 34 kortelė

    Klausimas

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

    Atsakymas

    coulomb (C).

  35. 35 kortelė

    Klausimas

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

    Atsakymas

    weber (Wb).

  36. 36 kortelė

    Klausimas

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

    Atsakymas

    lux (lx).

  37. 37 kortelė

    Klausimas

    What quantity uses the radian (rad)?

    Atsakymas

    Plane angle.

  38. 38 kortelė

    Klausimas

    What quantity uses the joule (J)?

    Atsakymas

    Energy, work, and amount of heat.

  39. 39 kortelė

    Klausimas

    What quantity uses the ohm (Ω)?

    Atsakymas

    Electric resistance.

  40. 40 kortelė

    Klausimas

    What quantity uses the degree Celsius (°C)?

    Atsakymas

    Celsius temperature.

  41. 41 kortelė

    Klausimas

    What quantity uses the sievert (Sv)?

    Atsakymas

    Dose equivalent.

  42. 42 kortelė

    Klausimas

    What quantity uses the newton (N)?

    Atsakymas

    Force.

  43. 43 kortelė

    Klausimas

    What quantity uses the volt (V)?

    Atsakymas

    Electric potential difference.

  44. 44 kortelė

    Klausimas

    What quantity uses the tesla (T)?

    Atsakymas

    Magnetic flux density.

  45. 45 kortelė

    Klausimas

    What quantity uses the becquerel (Bq)?

    Atsakymas

    Activity referred to a radionuclide.

  46. 46 kortelė

    Klausimas

    What quantity uses the steradian (sr)?

    Atsakymas

    Solid angle.

  47. 47 kortelė

    Klausimas

    What quantity uses the watt (W)?

    Atsakymas

    Power and radiant flux.

  48. 48 kortelė

    Klausimas

    What quantity uses the siemens (S)?

    Atsakymas

    Electric conductance.

  49. 49 kortelė

    Klausimas

    What quantity uses the lumen (lm)?

    Atsakymas

    Luminous flux.

  50. 50 kortelė

    Klausimas

    What quantity uses the katal (kat)?

    Atsakymas

    Catalytic activity.

  51. 51 kortelė

    Klausimas

    What quantity uses the pascal (Pa)?

    Atsakymas

    Pressure and stress.

  52. 52 kortelė

    Klausimas

    What quantity uses the farad (F)?

    Atsakymas

    Capacitance.

  53. 53 kortelė

    Klausimas

    What quantity uses the henry (H)?

    Atsakymas

    Inductance.

  54. 54 kortelė

    Klausimas

    What quantity uses the gray (Gy)?

    Atsakymas

    Absorbed dose and kerma.

  55. 55 kortelė

    Klausimas

    What quantity uses the hertz (Hz)?

    Atsakymas

    Frequency.

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

    110 kortelių

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

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  56. 56 kortelė

    Klausimas

    What quantity uses the coulomb (C)?

    Atsakymas

    Electric charge.

  57. 57 kortelė

    Klausimas

    What quantity uses the weber (Wb)?

    Atsakymas

    Magnetic flux.

  58. 58 kortelė

    Klausimas

    What quantity uses the lux (lx)?

    Atsakymas

    Illuminance.

  59. 59 kortelė

    Klausimas

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

    Atsakymas

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

  60. 60 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻².

  61. 61 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻³·A⁻².

  62. 62 kortelė

    Klausimas

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

    Atsakymas

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

  63. 63 kortelė

    Klausimas

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

    Atsakymas

    m²·s⁻².

  64. 64 kortelė

    Klausimas

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

    Atsakymas

    kg·m·s⁻².

  65. 65 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻³·A⁻¹.

  66. 66 kortelė

    Klausimas

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

    Atsakymas

    kg·s⁻²·A⁻¹.

  67. 67 kortelė

    Klausimas

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

    Atsakymas

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

  68. 68 kortelė

    Klausimas

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

    Atsakymas

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

  69. 69 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻³.

  70. 70 kortelė

    Klausimas

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

    Atsakymas

    kg⁻¹·m⁻²·s³·A².

  71. 71 kortelė

    Klausimas

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

    Atsakymas

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

  72. 72 kortelė

    Klausimas

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

    Atsakymas

    mol·s⁻¹.

  73. 73 kortelė

    Klausimas

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

    Atsakymas

    kg·m⁻¹·s⁻².

  74. 74 kortelė

    Klausimas

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

    Atsakymas

    kg⁻¹·m⁻²·s⁴·A².

  75. 75 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻²·A⁻².

  76. 76 kortelė

    Klausimas

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

    Atsakymas

    m²·s⁻².

  77. 77 kortelė

    Klausimas

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

    Atsakymas

    s⁻¹. Use Hz for periodic phenomena.

  78. 78 kortelė

    Klausimas

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

    Atsakymas

    A·s.

  79. 79 kortelė

    Klausimas

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

    Atsakymas

    kg·m²·s⁻²·A⁻¹.

  80. 80 kortelė

    Klausimas

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

    Atsakymas

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

  81. 81 kortelė

    Klausimas

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

    Atsakymas

    radian (rad).

  82. 82 kortelė

    Klausimas

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

    Atsakymas

    joule (J).

  83. 83 kortelė

    Klausimas

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

    Atsakymas

    ohm (Ω).

  84. 84 kortelė

    Klausimas

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

    Atsakymas

    degree Celsius (°C).

  85. 85 kortelė

    Klausimas

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

    Atsakymas

    sievert (Sv).

  86. 86 kortelė

    Klausimas

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

    Atsakymas

    newton (N).

  87. 87 kortelė

    Klausimas

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

    Atsakymas

    volt (V).

  88. 88 kortelė

    Klausimas

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

    Atsakymas

    tesla (T).

  89. 89 kortelė

    Klausimas

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

    Atsakymas

    becquerel (Bq).

  90. 90 kortelė

    Klausimas

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

    Atsakymas

    steradian (sr).

  91. 91 kortelė

    Klausimas

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

    Atsakymas

    watt (W).

  92. 92 kortelė

    Klausimas

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

    Atsakymas

    siemens (S).

  93. 93 kortelė

    Klausimas

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

    Atsakymas

    lumen (lm).

  94. 94 kortelė

    Klausimas

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

    Atsakymas

    katal (kat).

  95. 95 kortelė

    Klausimas

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

    Atsakymas

    pascal (Pa).

  96. 96 kortelė

    Klausimas

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

    Atsakymas

    farad (F).

  97. 97 kortelė

    Klausimas

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

    Atsakymas

    henry (H).

  98. 98 kortelė

    Klausimas

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

    Atsakymas

    gray (Gy).

  99. 99 kortelė

    Klausimas

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

    Atsakymas

    hertz (Hz).

  100. 100 kortelė

    Klausimas

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

    Atsakymas

    coulomb (C).

  101. 101 kortelė

    Klausimas

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

    Atsakymas

    weber (Wb).

  102. 102 kortelė

    Klausimas

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

    Atsakymas

    lux (lx).

  103. 103 kortelė

    Klausimas

    How are SI unit names capitalized in English?

    Atsakymas

    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. 104 kortelė

    Klausimas

    What determines capitalization in an SI unit symbol?

    Atsakymas

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

  105. 105 kortelė

    Klausimas

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

    Atsakymas

    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. 106 kortelė

    Klausimas

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

    Atsakymas

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

  107. 107 kortelė

    Klausimas

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

    Atsakymas

    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. 108 kortelė

    Klausimas

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

    Atsakymas

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

  109. 109 kortelė

    Klausimas

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

    Atsakymas

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

  110. 110 kortelė

    Klausimas

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

    Atsakymas

    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 kortelių

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

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