B
Bjwert
Guest
As a rough guide, copper wires can conduct about 10A mm^-2 before overheating and there are approximately 10^20 free electrons per mm^3 in copper.
a) No. of electron per second for this current = 6.25x10^19
b) Length of wire with cross section 1mm^2 containing this number of electrons = 0.625mm
HERE'S WHERE I'M STUCK:
c) The average drift velocity of electrons in the wire
d) If the same wire carried a current of only 10mA, what would the drift velocity be, and how long would it take a typical electron to drift through 1mm?
So, I'm looking for help on parts c) and d).
As always any help is greatly appreciated - thank you!
a) No. of electron per second for this current = 6.25x10^19
b) Length of wire with cross section 1mm^2 containing this number of electrons = 0.625mm
HERE'S WHERE I'M STUCK:
c) The average drift velocity of electrons in the wire
d) If the same wire carried a current of only 10mA, what would the drift velocity be, and how long would it take a typical electron to drift through 1mm?
So, I'm looking for help on parts c) and d).
As always any help is greatly appreciated - thank you!