Why does capacitor block dc supply?
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Answer / sujin
For a dc signal frequency is approximately 0.
For a capacitor reactance ( Xc) is 1/2*3.14*f
Since f is or approximately 0 Xc= infinity.
Hence it blocks dc current
Is This Answer Correct ? | 32 Yes | 0 No |
i=C(dV/dt)
for dc instantaneous change in voltage=o
dV/dt=o
...i=o for dc supply mens no current..
so capacitor block dc supply
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / bhabani
capacutive reactance is inversely proportional to frequency.
for dc f=0.thus very high reactance to current
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / devsingh boda
ANS1,ANS3,ANS4 are correct.ie,
We can answer this question in two ways,
1.Capacitive reactance is inversely proportional to frequency since,Xc=[1/(2*Pi*f*C)] which implies Xc is inversely proportional to f. For dc f=0 , so Xc is approximately equal to infinite(very high).So current does not flow.
2.We know that capacitive current, Ic=C*[dVc/dt]...
If dc supply is applied across capacitor then dVc/dt becomes zero since dc voltage is a constant(steady) voltage.So Ic also becomes zero.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / shahbaz
because the capacitor is used to store the charges and in
const supply there is no any storege is carried out hence
ckt is not complete.
Is This Answer Correct ? | 4 Yes | 4 No |
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