Strange current

  • Thread starter Chemist@
  • Start date
  • #1
Chemist@
115
1
How is the current that pushes electricity through the space between the two plates of the capacitor called?
 

Answers and Replies

  • #2
Stephen Tashi
Science Advisor
7,769
1,534
Are you thinking of "displacement current"?
 
  • #3
Chemist@
115
1
Yes, thank you.
 
  • #4
Chemist@
115
1
How is this current connected to the turbulent current and the surface current?
 
  • #5
Svein
Science Advisor
Insights Author
2,242
765
No current is flowing "through" the capacitor. Current flowing onto one plate creates a charge which sets up an electric field which again repels some charge on the other plate. Therefore you can "load" the capacitor with a charge by connecting it to a voltage source. You can then transport this charge by disconnecting the capacitor and moving it somewhere else.
 
  • Like
Likes davenn
  • #6
Chemist@
115
1
But why and how does AC pass through the capacitor?
 
  • #7
davenn
Science Advisor
Gold Member
2021 Award
9,625
8,841
But why and how does AC pass through the capacitor?

It doesn't, because AC is cycling, the polarity of the charge on each of the plates of the capacitor is also constantly alternating
at the frequency of the AC signal (voltage)

Dave
 
  • #8
Svein
Science Advisor
Insights Author
2,242
765
But why and how does AC pass through the capacitor?
It does not. An alternating current will charge and discharge one plate, which means that the electrical field will change which again will change the charge on the other plate. A change in the charge means that a current will pass out of or come onto the plate. Thus, it seems as if current "passes through", but in reality it is interaction between current, charge and field.

To repeat the basics: Q = C*V. If things change over time, you get dQ/dt = C*dV/dt, and dQ/dt is the current out of or onto the plate.
 

Suggested for: Strange current

  • Last Post
Replies
13
Views
499
  • Last Post
Replies
6
Views
319
  • Last Post
Replies
4
Views
194
Replies
0
Views
249
  • Sticky
  • Last Post
Replies
0
Views
903
  • Last Post
Replies
1
Views
216
  • Last Post
Replies
5
Views
559
  • Last Post
Replies
9
Views
472
Top