What is the current density in an aluminum wire having a radius of 9 mm and carrying a current of 7 mA? i got this J I/Aand got 27.51 A/m^2What is the drift speed of the electrons carrying this current? The density of aluminum is 2700 kg/m3, and 1 mole of aluminum has a mass of 26.98 gThere is one conduction electron per atom in aluminum.this one i'm having trouble thakn you
To each his own I guessBody temperatures vary, what's right for you may not be for him.
v_drift I/(n?q?A) where I - current n - number of charge carriers per volume q - charge f each charge carrier A - cross-sectional area of the wire You've got ne charge carrier per atom, hence n equals the number of atoms per volumeYou get this value when you divide the density by the molar mass: n ρ/m 2700 kg/m? / (0.02698 kg / 6.022×10?? ) 6.026×10?? m?? (i.e atoms per volume) The charge carriers are electrons, hence q e 1.602×10??? C The area of the wire is A π?r? π ? (9×10??m)? 2.545×10?? m? v_drift 7.0×10?? A / (6.026×10?? m?? ? 1.602×10??? A?s ? 2.545×10?? m? 2.85×10?? m?s??
