What material is the wire made with a length of 1 km and a cross section of 10 m / k if the current is 3A

What material is the wire made with a length of 1 km and a cross section of 10 m / k if the current is 3A and the direction is 120 volts

First, we determine the value of the resistance in this wire.

To do this, we divide the indicated voltage in the wire by the current that flows through it.

We get:

R = U / I = 120/3 = 40 ohms.

We determine the value of resistivity using the following formula:

p = R * S / L,
Where:

p – resistivity.

R is the resistance in the wire.

L is the wire length.

S – wire cross-section.

We translate all values into the C system.

1 km = 1000 m = 100000 cm = 1,000,000 mm.

p = 40 * 10 / 1,000,000 = 0.4 Ohm * mm2

From the table of resistivity, the most approximate value is Nickelin or Manganin alloy.