Determine the conductivity of the conductor in which a current of 0.5A passes at a voltage of 12V.

We find the resistance of the conductor, for this we will use the law for a homogeneous section of Ohm’s electrical circuit:

I = U / R,

where I is the current strength, U is the voltage at the ends of the conductor, R is the resistance of the conductor.

From this formula, we find R:

R = U / I.

Let’s calculate the resistance of the conductor:

R = U / I = 12 / 0.5 = 24 (Ohm).

Now, we must take into account that conductivity (S) is a physical quantity inverse to resistance, that is:

S = 1 / R,

S = 1/24 ≈ 0.042 (cm).

Answer: S ≈ 0.042 (cm).