View Feed
group-icon
Electronics
Community of Electronics Engineers to discuss all concepts, topics, questions and doubts.
612 Members
Join this group to post and comment.
praky
praky • May 1, 2010

Fully charged capacitor short circuited?

What will happen if afully charged ideal capacitor is short circuited with an ideal 0 resistance wire? Will the capacitor change polarity?

What will happen if an ideal ideal inductor is connected across a battery of say E volts. what will the variation of current?
lal
lal • May 1, 2010
I think the capacitor would discharge momentarily. Since there is no resistance to limit the current flow in this case.

An inductor is of no use in dc applications. If you connect an inductor across a battery, its same as short circuiting it!
praky
praky • May 1, 2010
lal
I think the capacitor would discharge momentarily. Since there is no resistance to limit the current flow in this case.

An inductor is of no use in dc applications. If you connect an inductor across a battery, its same as short circuiting it!

how will the capacitor discharge and if it discharges within a moment then where does the energy go since there is no resistance in the ckt?

inductor will short ckt battery at steady state only. When battery will be connected the inductor will behave as open switch. i am asking for the current variation till steady state...
It will again charge the capacitor again,but polarity wont be changing,as for Inductor no effect on current since it is DC, it might effect little variation in voltage


praky
how will the capacitor discharge and if it discharges within a moment then where does the energy go since there is no resistance in the ckt?

inductor will short ckt battery at steady state only. When battery will be connected the inductor will behave as open switch. i am asking for the current variation till steady state...
Capacitor can discharge with the resistance of the Voltage source!
reachrkata
reachrkata • May 3, 2010
In fact the capacitors never charges again. All the electrons in the -ve terminal flow instantaneously to neutralise the positively charged terminal. The Energy is lost as EM waves. This is the same concept of EMP (electro magnetic pulse) heard in the Matrix movies.

-Karthik
😁
praky
praky • May 4, 2010
reachrkata
In fact the capacitors never charges again. All the electrons in the -ve terminal flow instantaneously to neutralise the positively charged terminal. The Energy is lost as EM waves. This is the same concept of EMP (electro magnetic pulse) heard in the Matrix movies.


satisfied.

In inductor problem, will the current never rise across inductor?
reachrkata
reachrkata • May 5, 2010
No it will rise, but not instantaneously. It will rise exponentially.

-Karthik
praky
praky • May 5, 2010
reachrkata
No it will rise, but not instantaneously. It will rise exponentially.

-Karthik
I think the current should rise linearly since no resistance is there.
aj_onduty
aj_onduty • Aug 26, 2010
praky
I think the current should rise linearly since no resistance is there.

The inductor acts as an open circuit initially, and then it slowly, but exponentially, loses that property.
The reverse happens in capacitors.
bohar
bohar • Aug 26, 2010
i think capacitor will discharge because ideal wire has no resistance to limit the current.
Dave Hill
Dave Hill • Oct 2, 2015
If no external resistance is applied (short circuit) the capacitor will discharge at a rate only limited by it's own internal resistance. The amount of heat generated in the capacitor can be excessive when this happens and can be determined by the number of joules expended shorting a capacitor across its effective internal resistance.

Share this content on your social channels -