What is the current strength in a section of a circuit consisting of a constant wire 10 m

What is the current strength in a section of a circuit consisting of a constant wire 10 m long and 1.2 mm2 in cross section, if the voltage at the ends of this section is 20 V?

Initial data: l (length of constantan wire) = 10 m; S (cross-sectional area of constantan wire) = 1.2 mm ^ 2, U (voltage at the ends of the section) = 20 V.

Reference data: ρ (resistivity constantan) = 0.5 Ohm * mm ^ 2 / m.

1) Determine the resistance of the constantan wire: R = ρ * l / S = 0.5 * 10 / 1.2 = 4.17 Ohm.

2) Calculate the current in the circuit section: I = U / R = 20 / 4.17 ≈ 4.8 A.

Answer: The current in the circuit section is 4.8 A.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.