The voltage in the circuit is 12 V, and the current is 2 A. What material is the conductor made

The voltage in the circuit is 12 V, and the current is 2 A. What material is the conductor made of if its cross-section is 63 mm² and the length is 1.8 km?

Given:

U = 12 Volts – voltage in the electrical circuit;

I = 2 Amperes – current strength;

s = 63 mm2 (square millimeters) is the specific cross-section of the conductor;

l = 1.8 kilometers = 1800 meters.

It is required to determine what material the conductor is made of.

Let’s find the total resistance of the conductor:

R = U / I = 12/2 = 6 ohms.

Then, the resistivity of the conductor will be equal to:

r = R * s / l = 6 * 63/1800 = 378/1800 = 0.21 Ohm * mm2 / m.

From the table we find that this specific resistance corresponds to the material lead.

Answer: The conductor is made of lead.