b) Mean drift velocity
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4 Terms
1
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define mean drift velocity
the net velocity of electrons travelling through a conductor
2
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state the formula for electric current including mean drift velocity
I = Anev
electric current (A) = cross-sectional area of the conductor (m²) × number density (m-3) × elementary charge × velocity (ms-1)
3
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state the relationship between cross-sectional area and mean drift velocity
inversely proportional
4
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state why cross-sectional area and mean drift velocity are inversely proportional
for electric current to stay the same → mean drift velocity must decrease if cross-sectional area increases
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