Question

What is the operational impedance of an R.C. Circuit? Describe its usefulness.

Due to capacitance the voltage lags the current and so can be seen from the graph

i.e. is in downward direction.

The impedance Z is given as

Z = √( R )2 + (Xe) 2

Xe –: capacitor reactance.

And Ve = / 2πfc Ω

f – frequency. c – capacitance if farade.

This R.C circuit can be used in 2 ways.

Such R.C circuits are widely used in electronic circuits

Filter circuit- to remove pulsation from rectifier and AC

Phase shift circuit – where 180degree phase difference is needed.

Operational amplifiers – where high I/P impedance is needed

Timer circuit

Electronic circuit.