capacitor allow dc or ac

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Bhuvanesh123

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i have read some pages .there i seen that some say that capacitor allow dc and block ac and some say blocks dc and allow ac.which one is right which is really series problem to me.pull me out of this.thank you in advance
 

Bhuvanesh123 said:
i have read some pages .there i seen that some say that capacitor allow dc and block ac and some say blocks dc and allow ac.which one is right which is really series problem to me.pull me out of this.thank you in advance
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a fully charged capacitor does not allow dc..while ac gives continuous charging and discharging so no current flow through capacitor
 

the capacitor allow AC only to go through it
but in the transient of dc you can consider it as AC until the capacitor is fully charged
if you need more information about charge time and what is the factors effect it ,i'll more than happy to help you
 
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Buddy simply remember that capacitor allows time varying voltage, meaning if we are analysing DC trasient (a voltage that is either growing or decaying with time) or any AC form it shall pass through the cap.
 

the current inside the capacitor = i = C x dv/dt that means there will be current as long as there is a vaying voltage across its terminals and dv/dt = 0 in case of dc voltage, i.e the capacitor will block dc and allow ac to pass.
 

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