In text books, the physical quantity is commonly denoted by “I”.  If voltage is denoted by referencing it’s first letter V, why current is not denoted by C?

Why is current denoted with I?

 

Let’s discuss the causes behind this.

The first reason comes in the mind that the letter has already been used to denote the Capacitance. The same letter can not be used twice. Though this argument is not strong enough.

Actually “I” is originated from the French phrase intensité de courant, or in Englishcurrent intensity. it denotes the ‘intensity’ of the flow of electrons through a closed path.The I symbol was used by André-Marie Ampère himself, after whom the unit of electric current is named.

 

 

 

 

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