Question

The voltage,V, in an electrical unit is related to the current,I, and the resistance,R, by the equation V=IR. The current is decreasing at -4amps/sec as the resistance increases at 20ohms/sec. How fast is the voltage changing when the voltage is 100 volts and the current is 20 amps?

Answer 1

If V = IR, then
dV/dt = IdR/dt + RdI/dt

plug in the given values, and solve for dV/dt
(You will have to find R from the first equation)

Answer 2

eru

Answer 3

380 volts/second