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Physics > SI Units > Flashcards

SI Units Flashcards

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1
Q

What are the 7 SI units?

A

Seconds
Metres
Mols
Amperes
Candela
Kg
Kelvin

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2
Q

What is a second?

A

Duration of a certain amount of oscillations of a caesium 133 atom

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3
Q

What is a mol?

A

The amount of substance that has the same amount of particles as there are atoms in 0.012kg (12g) of carbon 12

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4
Q

What is a metre?

A

Length travelled by light in a vacuum in 1/300 000 000 of a second

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5
Q

What is an ampere?

A

The current in 2 parallel conductors of infinite length placed 1m apart in a vacuum that would produce a force of 2x10-7 N/m

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6
Q

What is a candela?

A

The luminous intensity of monochromatic light

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7
Q

What is a Kelvin?

A

1/273.16 of the thermodynamic triple point of water

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8
Q

What are the SI prefixes for 10-12, 10-9, 10-6, 10-3, 10-2, 10-1, 10 +1 etc?

A

Pico, nano micro, milli, centi, deci

Deca, hecto, kilo, mega, Giga, tera

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9
Q

What units do we use to note speed?

A

m.s-1

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10
Q

What units do we use to note velocity?

A

m.s-1 with direction

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11
Q

What units do we use to note acceleration?

A

m.s-2

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12
Q

What units do we use to note current density?

A

A.m2

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13
Q

What unit do we use to measure energy?

A

Joules J

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14
Q

What unit do we use to measure power?

A

Watt W

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15
Q

What unit do we use to measure charge?

A

Coulomb C

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16
Q

What unit do we use to measure capacitance?

A

Farad F

17
Q

What unit do we use to measure inductance?

A

Henry H

18
Q

What unit do we use to measure magnetic flux?

A

Weber Wb

19
Q

What unit do we use to measure magnetic flux density?

A

Tesla T

20
Q

How do we change Celsius into Kelvins?

A

Add 273.15 e.g. 1c = 274.15k

21
Q

What units do we use to measure newtons?

A

Kg.m.s-2

22
Q

What units do we use to measure pascals?

A

Kg.m-1.s-2

23
Q

What units do we use to measure joules?

A

Kg.m2.s-2

24
Q

What unit do we use to measure Ohms?

A

Kg.m2.s-3.A-2

25
Q

How do atmospheres, kPa and bar’s compare to each other at sea level?

A

1 atmosphere (average pressure at sea level) = 101.3kpa = 1.013 bar

I.e. 1 atm = 100kpa = 1 bar

26
Q

How does one atm compare to: PSI, mmHg and cmH2O?

A

1 atm = 14.69 PSI = 760mmHg and 1033 cmH2O

27
Q

How does 1kpa compare to cmH2O and mmHg?

A

1kpa = 10.3cmH2O and 7.6mmHg

28
Q

Ampere gives the quantity of……?

A

Electrical current

29
Q

Kg gives the quantity of…..?

A

Mass

30
Q

How can you change cmH2O to mmHg?

A

Multiple by 0.76

31
Q

What is a googol?

A

Prefix for 1x10 to the power of 100

32
Q

What is the prefix Tera in numbers?

A

1 000 000 000 000

33
Q

What is the prefix pico in numbers?

A

0.000 000 000 001

34
Q

How do we change mmHg to kPa?

A

Divide by 7.6

Physics (15 decks)

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