All Questions
5
questions with no upvoted or accepted answers
1
vote
0
answers
2k
views
What happens to metal when exposed to an electric current for an extended period of time?
I was wondering what happens to the actual metal (copper, aluminum, silver, gold) when electricity is ran through it for a long period of time. Say years like the wire in a house. Does the ...
- 11
0
votes
0
answers
27
views
Can you measure different currents at different contact points for a volume of material made of two different metals with different conductivities?
My question is about the variation of conductivity in a volume of material and its effect on measured current. A volume is comprised of two metals joined symmetrically in a cuboid shape as in the ...
0
votes
1
answer
71
views
How is electric current possible if no electric field exists inside a conductor?
How is electric current possible if no electric field exists inside a conductor?
Since no electric field exists inside a conductor. How is electric current possible as $$v_d=\frac{(eE)t}{2m},\;\;{E=0}...
- 1
0
votes
0
answers
614
views
Current equation $I=nqA\vec{v}_d$
I was reading from several introductory E&M materials, and they all state that $$I=neA\vec{v}_d$$where $n$ is number of free charge carriers, $e$ is the elementary charge of electron, $A$ is cross-...
-1
votes
1
answer
66
views
How electric current is defined in a metal wire?
How current is defined if in a metal wire both positive and negative charge exist? Isn't the total charge/time 0?
- 1,648