
#1
Mar1212, 12:27 AM

P: 4

I know that a charge is discribed in terms of coulombs. But how did they know that an electron has a charge of 1.60217646 × 1019 coulomb ? by the way , what is a coulomb exactly ? and how did they found or discribed its quantity ? I would like the answer to be in details please . Thanks




#2
Mar1212, 12:35 AM

P: 1,781

Look up the Millikan oil drop experiment.
A coulomb is exactly that amount of charge which results from a current of one Ampere flowing for one second. 



#3
Mar1212, 05:15 AM

P: 4

you said it is " the amount of charge which results from a current of one Ampere flowing for one second " ,, what is Ampere ? and how would we find it ? ( suppose we want to calculate the charge and the magnitude of the charge is not given)




#4
Mar1212, 05:30 AM

Sci Advisor
HW Helper
Thanks
P: 26,167

How did they measure the charge of electron
Hi Boody! Welcome to PF!
From the PF Library … the amp is that current which in a pair of wires a metre apart would produce a force between them of 2 107 N/m 



#5
Mar1212, 09:38 AM

P: 4

mmmm, I see
Thanks :) 


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