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