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.
Mayelana naleli qoqo
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
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Quantity ↔ unit and symbol: recall each base quantity and every named derived quantity in both directions.
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Named unit ↔ coherent base-unit expression: expand all 22 special names, then reverse the mapping with the quantity supplied whenever an expression is shared.
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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.
Amakhadi akuleli qoqo
Ikhadi 1
Umbuzo
What is the SI base unit for time?
Impendulo
second (s).
Ikhadi 2
Umbuzo
What is the SI base unit for length?
Impendulo
metre (m).
Ikhadi 3
Umbuzo
What is the SI base unit for mass?
Impendulo
kilogram (kg).
Ikhadi 4
Umbuzo
What is the SI base unit for electric current?
Impendulo
ampere (A).
Ikhadi 5
Umbuzo
What is the SI base unit for thermodynamic temperature?
Impendulo
kelvin (K).
Ikhadi 6
Umbuzo
What is the SI base unit for amount of substance?
Impendulo
mole (mol).
Ikhadi 7
Umbuzo
What is the SI base unit for luminous intensity?
Impendulo
candela (cd).
Ikhadi 8
Umbuzo
Which SI base quantity uses the second (s)?
Impendulo
Time.
Ikhadi 9
Umbuzo
Which SI base quantity uses the metre (m)?
Impendulo
Length.
Ikhadi 10
Umbuzo
Which SI base quantity uses the kilogram (kg)?
Impendulo
Mass.
Ikhadi 11
Umbuzo
Which SI base quantity uses the ampere (A)?
Impendulo
Electric current.
Ikhadi 12
Umbuzo
Which SI base quantity uses the kelvin (K)?
Impendulo
Thermodynamic temperature.
Ikhadi 13
Umbuzo
Which SI base quantity uses the mole (mol)?
Impendulo
Amount of substance.
Ikhadi 14
Umbuzo
Which SI base quantity uses the candela (cd)?
Impendulo
Luminous intensity.
Ikhadi 15
Umbuzo
Which SI unit with a special name is used for plane angle?
Impendulo
radian (rad).
Ikhadi 16
Umbuzo
Which SI unit with a special name is used for energy, work, or amount of heat?
Impendulo
joule (J).
Ikhadi 17
Umbuzo
Which SI unit with a special name is used for electric resistance?
Impendulo
ohm (Ω).
Ikhadi 18
Umbuzo
Which SI unit with a special name is used for Celsius temperature?
Impendulo
degree Celsius (°C).
Ikhadi 19
Umbuzo
Which SI unit with a special name is used for dose equivalent?
Impendulo
sievert (Sv).
Ikhadi 20
Umbuzo
Which SI unit with a special name is used for force?
Impendulo
newton (N).
Ikhadi 21
Umbuzo
Which SI unit with a special name is used for electric potential difference?
Impendulo
volt (V).
Ikhadi 22
Umbuzo
Which SI unit with a special name is used for magnetic flux density?
Impendulo
tesla (T).
Ikhadi 23
Umbuzo
Which SI unit with a special name is used for activity referred to a radionuclide?
Impendulo
becquerel (Bq).
Ikhadi 24
Umbuzo
Which SI unit with a special name is used for solid angle?
Impendulo
steradian (sr).
Ikhadi 25
Umbuzo
Which SI unit with a special name is used for power or radiant flux?
Impendulo
watt (W).
Ikhadi 26
Umbuzo
Which SI unit with a special name is used for electric conductance?
Impendulo
siemens (S).
Ikhadi 27
Umbuzo
Which SI unit with a special name is used for luminous flux?
Impendulo
lumen (lm).
Ikhadi 28
Umbuzo
Which SI unit with a special name is used for catalytic activity?
Impendulo
katal (kat).
Ikhadi 29
Umbuzo
Which SI unit with a special name is used for pressure or stress?
Impendulo
pascal (Pa).
Ikhadi 30
Umbuzo
Which SI unit with a special name is used for capacitance?
Impendulo
farad (F).
Ikhadi 31
Umbuzo
Which SI unit with a special name is used for inductance?
Impendulo
henry (H).
Ikhadi 32
Umbuzo
Which SI unit with a special name is used for absorbed dose or kerma?
Impendulo
gray (Gy).
Ikhadi 33
Umbuzo
Which SI unit with a special name is used for frequency?
Impendulo
hertz (Hz).
Ikhadi 34
Umbuzo
Which SI unit with a special name is used for electric charge?
Impendulo
coulomb (C).
Ikhadi 35
Umbuzo
Which SI unit with a special name is used for magnetic flux?
Impendulo
weber (Wb).
Ikhadi 36
Umbuzo
Which SI unit with a special name is used for illuminance?
Impendulo
lux (lx).
Ikhadi 37
Umbuzo
What quantity uses the radian (rad)?
Impendulo
Plane angle.
Ikhadi 38
Umbuzo
What quantity uses the joule (J)?
Impendulo
Energy, work, and amount of heat.
Ikhadi 39
Umbuzo
What quantity uses the ohm (Ω)?
Impendulo
Electric resistance.
Ikhadi 40
Umbuzo
What quantity uses the degree Celsius (°C)?
Impendulo
Celsius temperature.
Ikhadi 41
Umbuzo
What quantity uses the sievert (Sv)?
Impendulo
Dose equivalent.
Ikhadi 42
Umbuzo
What quantity uses the newton (N)?
Impendulo
Force.
Ikhadi 43
Umbuzo
What quantity uses the volt (V)?
Impendulo
Electric potential difference.
Ikhadi 44
Umbuzo
What quantity uses the tesla (T)?
Impendulo
Magnetic flux density.
Ikhadi 45
Umbuzo
What quantity uses the becquerel (Bq)?
Impendulo
Activity referred to a radionuclide.
Ikhadi 46
Umbuzo
What quantity uses the steradian (sr)?
Impendulo
Solid angle.
Ikhadi 47
Umbuzo
What quantity uses the watt (W)?
Impendulo
Power and radiant flux.
Ikhadi 48
Umbuzo
What quantity uses the siemens (S)?
Impendulo
Electric conductance.
Ikhadi 49
Umbuzo
What quantity uses the lumen (lm)?
Impendulo
Luminous flux.
Ikhadi 50
Umbuzo
What quantity uses the katal (kat)?
Impendulo
Catalytic activity.
Ikhadi 51
Umbuzo
What quantity uses the pascal (Pa)?
Impendulo
Pressure and stress.
Ikhadi 52
Umbuzo
What quantity uses the farad (F)?
Impendulo
Capacitance.
Ikhadi 53
Umbuzo
What quantity uses the henry (H)?
Impendulo
Inductance.
Ikhadi 54
Umbuzo
What quantity uses the gray (Gy)?
Impendulo
Absorbed dose and kerma.
Ikhadi 55
Umbuzo
What quantity uses the hertz (Hz)?
Impendulo
Frequency.
amakhadi angu-110
SI Units Flashcards: 7 Base Units & 22 Named Derived Units
Funda leli qoqo mahhalaI-Nibomo iyavuleka ukuze uqale ukufunda.
Ikhadi 56
Umbuzo
What quantity uses the coulomb (C)?
Impendulo
Electric charge.
Ikhadi 57
Umbuzo
What quantity uses the weber (Wb)?
Impendulo
Magnetic flux.
Ikhadi 58
Umbuzo
What quantity uses the lux (lx)?
Impendulo
Illuminance.
Ikhadi 59
Umbuzo
Express the radian (rad) in coherent SI base units.
Impendulo
1. The symbol rad keeps the plane-angle context explicit.
Ikhadi 60
Umbuzo
Express the joule (J) in coherent SI base units.
Impendulo
kg·m²·s⁻².
Ikhadi 61
Umbuzo
Express the ohm (Ω) in coherent SI base units.
Impendulo
kg·m²·s⁻³·A⁻².
Ikhadi 62
Umbuzo
Express the degree Celsius (°C) in coherent SI base units.
Impendulo
K. A degree Celsius and a kelvin have the same size; their zero points differ.
Ikhadi 63
Umbuzo
Express the sievert (Sv) in coherent SI base units.
Impendulo
m²·s⁻².
Ikhadi 64
Umbuzo
Express the newton (N) in coherent SI base units.
Impendulo
kg·m·s⁻².
Ikhadi 65
Umbuzo
Express the volt (V) in coherent SI base units.
Impendulo
kg·m²·s⁻³·A⁻¹.
Ikhadi 66
Umbuzo
Express the tesla (T) in coherent SI base units.
Impendulo
kg·s⁻²·A⁻¹.
Ikhadi 67
Umbuzo
Express the becquerel (Bq) in coherent SI base units.
Impendulo
s⁻¹. Use Bq for stochastic nuclear transformations, not periodic phenomena.
Ikhadi 68
Umbuzo
Express the steradian (sr) in coherent SI base units.
Impendulo
1. The symbol sr keeps the solid-angle context explicit.
Ikhadi 69
Umbuzo
Express the watt (W) in coherent SI base units.
Impendulo
kg·m²·s⁻³.
Ikhadi 70
Umbuzo
Express the siemens (S) in coherent SI base units.
Impendulo
kg⁻¹·m⁻²·s³·A².
Ikhadi 71
Umbuzo
Express the lumen (lm) in coherent SI base units.
Impendulo
cd·sr. Since sr has unit one, this is dimensionally cd; sr keeps the solid-angle context explicit.
Ikhadi 72
Umbuzo
Express the katal (kat) in coherent SI base units.
Impendulo
mol·s⁻¹.
Ikhadi 73
Umbuzo
Express the pascal (Pa) in coherent SI base units.
Impendulo
kg·m⁻¹·s⁻².
Ikhadi 74
Umbuzo
Express the farad (F) in coherent SI base units.
Impendulo
kg⁻¹·m⁻²·s⁴·A².
Ikhadi 75
Umbuzo
Express the henry (H) in coherent SI base units.
Impendulo
kg·m²·s⁻²·A⁻².
Ikhadi 76
Umbuzo
Express the gray (Gy) in coherent SI base units.
Impendulo
m²·s⁻².
Ikhadi 77
Umbuzo
Express the hertz (Hz) in coherent SI base units.
Impendulo
s⁻¹. Use Hz for periodic phenomena.
Ikhadi 78
Umbuzo
Express the coulomb (C) in coherent SI base units.
Impendulo
A·s.
Ikhadi 79
Umbuzo
Express the weber (Wb) in coherent SI base units.
Impendulo
kg·m²·s⁻²·A⁻¹.
Ikhadi 80
Umbuzo
Express the lux (lx) in coherent SI base units.
Impendulo
cd·sr·m⁻². Since sr has unit one, this is dimensionally cd·m⁻²; sr keeps the solid-angle context explicit.
Ikhadi 81
Umbuzo
For plane angle, which named SI unit has the coherent base-unit expression 1?
Impendulo
radian (rad).
Ikhadi 82
Umbuzo
For energy, work, or amount of heat, which named SI unit has the coherent base-unit expression kg·m²·s⁻²?
Impendulo
joule (J).
Ikhadi 83
Umbuzo
For electric resistance, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻²?
Impendulo
ohm (Ω).
Ikhadi 84
Umbuzo
For Celsius temperature, which named SI unit has the coherent base-unit expression K?
Impendulo
degree Celsius (°C).
Ikhadi 85
Umbuzo
For dose equivalent, which named SI unit has the coherent base-unit expression m²·s⁻²?
Impendulo
sievert (Sv).
Ikhadi 86
Umbuzo
For force, which named SI unit has the coherent base-unit expression kg·m·s⁻²?
Impendulo
newton (N).
Ikhadi 87
Umbuzo
For electric potential difference, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻¹?
Impendulo
volt (V).
Ikhadi 88
Umbuzo
For magnetic flux density, which named SI unit has the coherent base-unit expression kg·s⁻²·A⁻¹?
Impendulo
tesla (T).
Ikhadi 89
Umbuzo
For activity referred to a radionuclide, which named SI unit has the coherent base-unit expression s⁻¹?
Impendulo
becquerel (Bq).
Ikhadi 90
Umbuzo
For solid angle, which named SI unit has the coherent base-unit expression 1?
Impendulo
steradian (sr).
Ikhadi 91
Umbuzo
For power or radiant flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻³?
Impendulo
watt (W).
Ikhadi 92
Umbuzo
For electric conductance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s³·A²?
Impendulo
siemens (S).
Ikhadi 93
Umbuzo
For luminous flux, which named SI unit has the coherent base-unit expression cd·sr?
Impendulo
lumen (lm).
Ikhadi 94
Umbuzo
For catalytic activity, which named SI unit has the coherent base-unit expression mol·s⁻¹?
Impendulo
katal (kat).
Ikhadi 95
Umbuzo
For pressure or stress, which named SI unit has the coherent base-unit expression kg·m⁻¹·s⁻²?
Impendulo
pascal (Pa).
Ikhadi 96
Umbuzo
For capacitance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s⁴·A²?
Impendulo
farad (F).
Ikhadi 97
Umbuzo
For inductance, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻²?
Impendulo
henry (H).
Ikhadi 98
Umbuzo
For absorbed dose or kerma, which named SI unit has the coherent base-unit expression m²·s⁻²?
Impendulo
gray (Gy).
Ikhadi 99
Umbuzo
For frequency, which named SI unit has the coherent base-unit expression s⁻¹?
Impendulo
hertz (Hz).
Ikhadi 100
Umbuzo
For electric charge, which named SI unit has the coherent base-unit expression A·s?
Impendulo
coulomb (C).
Ikhadi 101
Umbuzo
For magnetic flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻¹?
Impendulo
weber (Wb).
Ikhadi 102
Umbuzo
For illuminance, which named SI unit has the coherent base-unit expression cd·sr·m⁻²?
Impendulo
lux (lx).
Ikhadi 103
Umbuzo
How are SI unit names capitalized in English?
Impendulo
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.
Ikhadi 104
Umbuzo
What determines capitalization in an SI unit symbol?
Impendulo
Symbols derived from proper names start with a capital letter; the others are lowercase. Case is mandatory and meaningful.
Ikhadi 105
Umbuzo
How do SI unit symbols behave in plurals and at sentence endings?
Impendulo
They never take a plural ending, and they take no period unless the symbol ends a sentence. Unit symbols are mathematical symbols, not abbreviations.
Ikhadi 106
Umbuzo
How should a number and an SI unit symbol be spaced?
Impendulo
Put a space between them: 25 m and 20 °C. In °C, the degree sign and C stay together.
Ikhadi 107
Umbuzo
Both hertz and becquerel reduce to s⁻¹. When is each used?
Impendulo
Use hertz (Hz) for periodic phenomena and becquerel (Bq) for activity referred to a radionuclide. The shared expression doesn't make the quantities interchangeable.
Ikhadi 108
Umbuzo
Both gray and sievert reduce to m²·s⁻². What distinguishes them?
Impendulo
Gray (Gy) is used for absorbed dose or kerma; sievert (Sv) is used for dose equivalent. The quantity context determines the special name.
Ikhadi 109
Umbuzo
Radian and steradian both have coherent unit expression 1. What distinguishes them?
Impendulo
Radian (rad) is used for plane angle; steradian (sr) is used for solid angle. Their symbols preserve the quantity context.
Ikhadi 110
Umbuzo
For temperature intervals, how do kelvin and degrees Celsius compare?
Impendulo
A change of 1 K equals a change of 1 °C. Their zero points differ, so absolute temperatures aren't numerically equal.
amakhadi angu-110
SI Units Flashcards: 7 Base Units & 22 Named Derived Units
I-Nibomo iyavuleka ukuze uqale ukufunda.