The voltage at the ends of the conductor is 12 V, the current strength in it is 3A determinant of the resistance of the conductor.

Given:

U = 12 Volts – voltage at the ends of the conductor;

I = 3 A (Ampere) – current in the conductor.

It is necessary to determine R (Ohm) – the resistance of the conductor.

To determine the resistance of a conductor, you must use the following formula (Ohm’s law for a section of a circuit):

U = R * I, from here we get that:

R = U / I = 12/3 = 4 ohms.

Answer: the resistance of the conductor is 4 ohms.