Question

What is the SI unit of electric charge ?​

Answer 1

coulomb

Electric charge has the dimension electric current time. The SI derived unit of electric charge is the coulomb, which is defined as an ampere second.

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Answer 2

The SI unit of electric charge is coulomb which is denoted by the letter C. We can define this unit of charge as follows : One coulomb is that quantity of electric charge which exerts a force of 9 x 10' newtons on an equal charge placed at a distance of 1 metre from it. We now know that all the matter contains positively charged particles called protons and negatively charged particles called electrons. A proton possesses a positive charge of 1.6 x 10-19 C whereas an electron possesses a negative charge of 1.6 x 10-19 C. It is obvious that the unit of electric charge called 'coulomb' is much bigger than the a proton or an electron. This point will become more clear from the following example.

We know that the charge of an electron is 1.6 x 10^-19 'coulomb' ( or 1.6 × 10^-19 C ). Now, if the charge is 1.6 × 10^-19 C, No. of electrons = 1

So, If the charge is 1 C, then No. of electrons =

» 1 / ( 1.6 × 10^-19 ) × 1

» 10^19 / 1.6

» 10 / 1.6 × 10^18

» 6.25 × 10^18

Thus, 6.25 × 10^18 electrons taken together constituting one coulomb of charge .