Quote Originally Posted by GoreBag
Uh.... .25 amperes per second. I would have answered before the due date, but, you know...video games. Anyway, this is university homework?
See, now helping him with the units is help. Giving him the answer... well.... more than I was willing to do.

Just so you understand Ice, the one constant in the equation is the voltage.

V=IR. If you take the derivative of both sides, dv/dt = R dI/dt + I dr/dt (using the chain rule). Now, you since voltage is constant, dv/dt = 0. Solving the rest is just algebra and plugging in the answers they gave you. If the initial resistance was 5 ohms, the initial current was 1A. Solving the above equation does indeed yield that dI/dt = -I/R dR/dt = -(1/5)*0.5 = -0.1 Amps/sec or 100mA/sec.

Are you an EE Ice, or is that just an example equation from your calculus book to 'keep it relevant'?