Why is the kinetic energy of current carriers associated with their ordered motion not taken into account when considering the electric current in a substance? Estimate the kinetic energy of one electron (in electron volts) at a current of I = 100 A in a sodium wire with a cross-section of S = 1 mm². The number of conduction electrons per unit volume of the wire n = 2.5⋅10²² cm⁻³.