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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