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Quick Physics Help!

a formula we need to know if physics is i=nAvQ, which of these constants do we need to know adn which are on the formula sheet? does anybody know????? also if we ned to know them what are they???? :frown:
Reply 1
Avatar for -G-a-v-
-G-a-v-
16
I don't know this formula very well since my exam board doesn't require it but I've seen I=nAvQ written as I=nAve before now, with e being the charge on the electron, which you will almost certainly be given. You'll find as you do revision and questions though you end up learning such data anyway because you use it that often.
just learn it. its easy just relate it back to equations you already know:

I= Current in Amps
n = Number of charge carriers per m^£ ( a charge carrier is an electron)
A = Cross sectional area in m^2
v = drift velocity for each electron in ms^-1
q = CHarge on each carrier/electron they give you the charge on each electron in the question its somthing like -1.6 * 10....

If your really bad at remembering it just try and remember it until the point when you get the paper and write it down! lol
Reply 3
Avatar for Mohit_C
Mohit_C
10
You pretty much get the hang of this at A2.:smile:
Reply 4
Avatar for uk_chip
uk_chip
OP
11
soz i just realised how stupid this question is, the only thing you need to know it Q (or e) which is 1.6x10^-19. the rest will be stated in the question or needed to b worked out. thx n e way
Reply 5
Avatar for spoonism
spoonism
No, I'm pretty sure they'd give you the charge on each electron too. At AS that is, dunno about A2.

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