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PHYSICS FRCA > SI units > Flashcards

SI units Flashcards

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1
Q

what are the international system of units?

A

7 base units of measurement which are dimensionally independent from which other units can be derived from

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2
Q

what are the 7 SI base units?

A

SMMACKK

second (s)
meter (m)
mole (mol)
ampere (A)
candela (Cd)
kilogram (Kg)
kelvin (K)

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3
Q

what is the base unit for length?

A

meter

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4
Q

what is the base unit for time?

A

second

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5
Q

what is the base unit for mass?

A

kilogram

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6
Q

what is the base unit for current?

A

ampere

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7
Q

what is the base unit for temperature?

A

kelvin

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8
Q

what is the base unit for amount of substance?

A

mole

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9
Q

what is candela a measurement of?

A

luminosity

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10
Q

what are the two supplementary units?

A

The plane angle (radian) and solid angle (steradian) were supplementary units
but this category was abolished in 1995. These units are considered named
derived units.

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11
Q

what is the derived units for volume, area and density?

A

volume - cubic meter - m^3
area - squared meter -m^2
density - kg per cubic meter- kg/m^3

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12
Q

what is the derived units for velocity and acceleration?

A

velocity - meters per second - m/s

accelaration - meters per second squared.

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13
Q

what is the derived units for force, pressure and energy?

A

force = Newtons = Kg.m.s-2

pressure = newtons per meter squared = kg·m–1·s–2

energy = joule = N.m = kg·m2
·s–2

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14
Q

what is the derived unit for power?

A

joules/ second
joules = N.m
N = kg.m.s-2

kg·m2 ·s–3

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15
Q

what is the derived units for electrical charge / coulombs?

A

A·s

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16
Q

what is the Electric potential
difference in derived units - volts?

A

volts = W/A

watts = J/s
J = N.m
N = kg.m.s-2

kg·m2·s–3·A–1

17
Q

what is the derived SI unit for capacitance?

A

Current / volt

kg–1·m–2·s4·A2

18
Q

define capacitance and 1 farad

A

Capacitance is the derived SI unit for ability for a device to store charge.
it is measured in farads.
where…
A capacitator with a capacitance of one farad will store one coulomb of charge when one volt is applied

19
Q

state the derived SI unit for Electrical
resistance?

A

units = Ohms
V/A
kg·m2·s–3·A–2

20
Q

what is tesla a measure of? what are its derived SI units?

A

magnetic flux density
Wb/m2
kg·s–2·A–1

Wb = V.s

21
Q

what is weber (Wb) a measure of? what are its derived SI units?

A

magnetic flux
V.s

kg·m2·s–2·A–1

22
Q

what is the unit for inductance and the SI derived units?

A

Henry (H)
Wb/A

kg·m2·s–2·A–2

23
Q

what are the following multiples of?

deca, hecto, kilo, mega, giga, tera

A

deca = 10^1
hecto = 10^2
kilo = 10^3
mega = 10^6
giga = 10^9
tera = 10^12

24
Q

what is the name of the following multiples…

10^15, 10^18, 10^21, 10^24

A

10^15 = pica
10^18 = exa
10^21 = zetta
10^24 = yotta

25
Q

what is the name of the following multiples…

10^-1, 10^-2, 10^-3, 10^-6, 10^-9, 10^-12, 10^-15, 10^-18, 10^-21, 10^-24

A

10^-1 = deci
10^-2 = centi
10^-3 = milli
10^-6 = micro
10^-9 = nano
10^-12 = pico
10^-15 = femto
10^-18 = atto
10^-21 = zepto
10^-24 = yocto

26
Q

what is a Sievert? what is this also called?

A

radiation dose per Kg
units = Sv = J/Kg

can also be called Gray for radiation absorbed - same derived SI units.

27
Q

what are the different units for pressure and conversion factors compared to 1atm?

A

1 atmosphere
760mmHg
760 Torr
101326 pascal
1.01325 barr
14.7 psi = pounds per square inch
1020 cm3 of water

28
Q

how is kelvin converted to degrees C?

A

K + 273.15

29
Q

what is the SI derived unit for frequency?

A

measured in Hertz = S^-1

30
Q

what is the derived SI for joules?

A

joules = work done
N.m
kg.m2.s-2

31
Q

what volume does 1 mole of gas occupy?

A

22.4 litres

32
Q

Kg is the base unit for what?

A

Mass

(not weight)

33
Q

what is the difference between weight and mass?

A

weight is the force acting on a mass
i.e. depending on gravity this will change

34
Q

what is the SI unit for volume?

A

M^3
Cubic meters

35
Q

what is 1atm in 1bar?

A

1 atmosphere = 1.013 Bar.

36
Q

what is SI unit for Newton?

A

kg m/s2

37
Q
A

PHYSICS FRCA (8 decks)

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