Units of physical quantities
1. State the basic, supplementary, and multiple physical units.
Solution:
Basic physical units:
| Length |
meter |
m
|
| Mass |
kilogram |
kg |
| Time |
second |
s |
Electric current
|
ampere |
A |
Thermodynamic temperature
|
kelvin |
K |
Amount of substance
|
mole |
mol |
| Luminous intensity |
candela |
cd |
Supplementary physical units:
Plane angle
|
radian |
rad
|
Solid angle
|
steradian |
sr |
Multiple physical units:
| giga |
G |
109 |
| mega |
M |
106 |
| kilo |
k |
103 |
| milli |
m |
10-3 |
| micro |
μ |
10-6 |
| nano |
n |
10-9 |
| pico |
p |
10-12 |
| hecto |
h |
102 |
| deca |
da |
101 |
| deci |
d |
10-1 |
| centi |
c |
10-2 |
2. State the derived physical units with names.
Solution:
Derived physical units with names:
| Frequency |
hertz |
Hz |
s-1 |
| Force |
newton |
N |
|
| Pressure |
pascal |
Pa |
N·m-2 |
Energy, work, heat
|
joule |
J |
N·m |
| Power |
watt |
W |
N·s-1 |
Electric charge
|
coulomb |
C |
A·s |
Electric voltage
|
volt |
V |
J·C-1 |
Electric capacitance
|
farad |
F |
C·V-1 |
Electric resistance
|
ohm |
Ω |
V·A-1 |
| Electric conductance |
siemens |
S |
A·V-1 |
Magnetic flux
|
weber |
Wb |
V·s |
| Inductance |
henry |
H |
Wb·A-1 |
Magnetic induction
|
tesla |
T |
Wb·m-2 |
Luminous flux
|
lumen |
lm |
cd·sr |
| Illuminance |
lux |
lx |
lm·m-2 |