# Current Entering And Leaving Battery

## Main Question or Discussion Point

Why the current entering and leaving the battery in an elctirc circuit needs to be same??plz provide a mathematical proof for this.
thanks

## Answers and Replies

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Why the current entering and leaving the battery in an elctirc circuit needs to be same??plz provide a mathematical proof for this.
thanks
Hi harshraj216 and welcome to Physics Forums!

Mathematical proofs are for mathematics. This is a physics/electronics question. Are you thinking of Kirchhoff's circuit laws? Please provide more info what you are thinking about.

Integral
Staff Emeritus
Gold Member
Electrons do not "pool" any where, every electron that leaves the battery must return. Where else is there for it to go? Since current is electron flow, current out must equal current in.

It is not really impossible. Bring one pole of an isolated battery close to a charged vandegraafgenerator, while keeping the battery in your hand, and making sure your hand is earthed. When the spark occurs, a current pulse will be entering the first pole of the battery while there is no current leaving at the other pole.
This also applies if you connected the poles of the battery by a high resistance (a simple 'electrical circuit'). The resistance should be high compared to the impedance for the current pulse to your hand.

sophiecentaur