1. ## A variation problem

The current flowing in an electrical circuit at a constant potential varies inversely as the resistance of the circuit. If the current is 25 amperes when the resistance is 4 ohms, what is the current when the resistance is 5 ohms?

3. Hello,

The current I variates inversely as the resistance R.

This means that there exists k such as :

I=k/R -> k=RI

For I=25, R=4.

And you want to know I' if R'=5.

So I'=k/R'=RI/R'=4*25/5=20

4. Originally Posted by mt_lapin