Derive I = nAVe
Over 1 second, electrons with drift velocity V travel through a wire of cross sectional area A. Distance Vt (t = 1) multiplied by area A gives a volume AV. This volume multiplied by the electron density of the material n, gives the number of electrons in volume V, nAV. The charge in the volume of material is found by multiplying the number of electrons by the elementary charge e, nAVe. This is the amount of charge passing through the wire every second, or current I. Therefore, I = nAVe
DD
Related Physics A Level answers
All answers ▸What is the difference between a scalar and a vector? Give 3 examples of each.
Find the angle at which total internal refraction takes place when light is going from glass to air.
An object orbits Earth at an altitude of 200 kilometers above the planet’s surface. What is its speed and orbital period?
Describe how emission spectra are formed and how they can be used to identify the elemental composition of a star.