Question

12. Write down the SI unit of the following.

a) electric current
b) amount of substance
c) length​

Answer 1

1. Electric current is defined as the rate of flow of charge
2. Since the charge is measured in coulombs and time in seconds, the electric current unit is Coulomb/Sec ( C/s )
3. Where, coulomb/sec is defined as Ampere
4. So the Ampere is the SI unit of the current.
5. Mole is used to represent the amount of a substance. For an element or a compound, mole is given by n= Weight in grams/Molecular Weight Its SI unit is mole.
6. the SI unit of length is metre