<Dl> <Dd> u = I n A q u = 1 C / s (8.5 × 10 28 m − 3) (3.14 × 10 − 6 m 2) (1.6 × 10 − 19 C) u = 2.3 × 10 − 5 m / s (\ displaystyle (\ begin (aligned) u& = (I \ over nAq) \ \ u& = (\ frac (1 (\ text (C)) / (\ text (s))) (\ left (8.5 \ times 10 ^ (28) (\ text (m)) ^ (- 3) \ right) \ left (3.14 \ times 10 ^ (- 6) (\ text (m)) ^ (2) \ right) \ left (1.6 \ times 10 ^ (- 19) (\ text (C)) \ right))) \ \ u& = 2.3 \ times 10 ^ (- 5) (\ text (m)) / (\ text (s)) \ end (aligned))) </Dd> </Dl> <Dd> u = I n A q u = 1 C / s (8.5 × 10 28 m − 3) (3.14 × 10 − 6 m 2) (1.6 × 10 − 19 C) u = 2.3 × 10 − 5 m / s (\ displaystyle (\ begin (aligned) u& = (I \ over nAq) \ \ u& = (\ frac (1 (\ text (C)) / (\ text (s))) (\ left (8.5 \ times 10 ^ (28) (\ text (m)) ^ (- 3) \ right) \ left (3.14 \ times 10 ^ (- 6) (\ text (m)) ^ (2) \ right) \ left (1.6 \ times 10 ^ (- 19) (\ text (C)) \ right))) \ \ u& = 2.3 \ times 10 ^ (- 5) (\ text (m)) / (\ text (s)) \ end (aligned))) </Dd> <P> Dimensional analysis: </P> <P> u = A electron m 3 ⋅ m 2 ⋅ C electron = C s 1 m ⋅ C = m s (\ displaystyle u = (\ dfrac (\ text (A)) ((\ dfrac (\ text (electron)) ((\ text (m)) ^ (3))) (\ cdot) (\ text (m)) ^ (2) \ cdot (\ dfrac (\ text (C)) (\ text (electron))))) = (\ dfrac (\ dfrac (\ text (C)) (\ text (s))) ((\ dfrac (1) (\ text (m))) (\ cdot) (\ text (C)))) = (\ dfrac (\ text (m)) (\ text (s)))) </P>

Drift velocity of a collection of charged particles to the electrical current and current density