Cal
posted by Sam .
A voltage V across a resistance R generates a current I=VR. If a constant voltage of 4 volts is put across a resistance that is increasing at a rate of 0.3 ohms per second when the resistance is 4 ohms, at what rate is the current changing?

i=V*r^1
di/dt= V/r^2 * dr/dt 
Thanks for nothing