AC through resistor and capacitor



ac through resistor and capacitor

Let a pure resistor and a pure capacitor be connected in series to an alternating emf. Let E be the rms value of applied emf and I be the rms value of the current flowing in the circuit. Let VR and VC be the potential drop across R and C respectively.

The potential drop across capacitor is

ac through resistor and capacitor

The potential drop across resistance isac through resistor and capacitor

 

From the fig the resultant OH is given by

ac through resistor and capacitor

This is the effective opposition offered by RC circuit for the flow of current.

Also

ac through resistor and capacitor

This shows that the potential lags the current by π/2 in RC circuit.