capacitors are connected in series in amplifier circuits for blocking dc from input.this means capacitor blocks direct current(low frequency) and allows alternating current(high frequency).
this is because of capacitive reactance Xc=1/2pif
if input frequency f is high,the reactance of a capacitor becomes low so it allows a signal passing through it.it means high frequency alternating current(AC) is allowed by a capacitor.
similarly,if input frequency f is low,the reactance of a capacitor becomes high so it not allows low signal passing through it.it means low frequency direct current(DC) is not allowed by a capacitor.
this is because of capacitive reactance Xc=1/2pif
if input frequency f is high,the reactance of a capacitor becomes low so it allows a signal passing through it.it means high frequency alternating current(AC) is allowed by a capacitor.
similarly,if input frequency f is low,the reactance of a capacitor becomes high so it not allows low signal passing through it.it means low frequency direct current(DC) is not allowed by a capacitor.
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