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