Question

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is
3 A (amperes), the resistance is
40 ohms. What is the current when the resistance is15ohms?

Answer 1

Ohms law

V=IR
V- voltage
I- current (in Amps)
R- resistance ( in ohms)

Answer 2

your question gives 2 cases

the first case, you have current and resistance
I= 3A
R=40 ohm

so you can calculate Voltage of the system

Answer 3

once you have the voltage of the system, you can rearrange ohms law to calculate current for a resistance of 15 ohms\[I=\frac{V}{R}\]