How many base SI units are there?
There are seven fundamental units of measurement:
- Second (time)
Ampere (electric current),
Candela (luminous intensity),
Mole (amount of a substance).
Derived units are combinations of the fundamental units. There are many examples, such as metres/second (speed), newtons (force), watts (power) and pascals (pressure).
Check out, for more derived units:
It gives a thorough chart, and shows how the units are derived.