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 ▸How does the photoelectric effect actually show that light is made up of particles?
Explain why gas bubbles rise faster through magma as they start to expand. (3)
How do I approach this question? Our teacher never explained it in class!
State Faraday's Law of electromagnetic induction, both qualitatively and quantitatively. How is Lenz's Law included in this? (4 marks)