K Kane2oo2 New Member Mar 12, 2004 #1 hi if u have say something that is rated at 36W and draws a constant current of 3A over 600seconds how would you work out the p.d across it? i got 0.02v .... but errr doesnt look right lol
hi if u have say something that is rated at 36W and draws a constant current of 3A over 600seconds how would you work out the p.d across it? i got 0.02v .... but errr doesnt look right lol
S spuffock Member Mar 12, 2004 #2 Divide the watts by the amps, thats 12v . The time does not affect the equation.
K Kane2oo2 New Member Mar 12, 2004 #3 lol i just got it now i was gunna reply but you did first....i was doing IVT instead of P/I for some strange reason thanks anyway dont spose you know how to calculate number of electrons flowing for that time period?
lol i just got it now i was gunna reply but you did first....i was doing IVT instead of P/I for some strange reason thanks anyway dont spose you know how to calculate number of electrons flowing for that time period?
S spuffock Member Mar 12, 2004 #4 you multiply the amps by the seconds to give you the charge in coulombs, then you divide that by the charge on an electron, which I can't remember off the top of my head. Ah,yes,its1.6022*10^-19. that,ll be about 11.2345*10^20 electrons
you multiply the amps by the seconds to give you the charge in coulombs, then you divide that by the charge on an electron, which I can't remember off the top of my head. Ah,yes,its1.6022*10^-19. that,ll be about 11.2345*10^20 electrons
P Painandsuffering New Member Mar 15, 2004 #5 wow!! All I have to say about this is thats a lot of electrons! lol.