Question

Electrical Current. The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is ¼ ampere when the resistance is 3840 ohms. What is the current when the resistance is 2160 ohms?

Answer 1

In first case,
I1 = 1/4 A = 0.25 A
R1 = 3840
V = ??

V = R1*I1 = 3840 * 0.25 = 960V

In second case
V = 960V
R2 = 2160
I2 = ??
I2 = V/R2 = 960/2160 = 0.44 A