# Current in a RC circuit

In order to find current in an RC circuit, resistance of only the resistor is considered i.e. $$I_\text{resistor} = V_\text{resistor} / R$$. Why is the reactance of the capacitor not considered? The frequency of the ac signal has an affect in circuit with a capacitor. Why is that effect is not considered while calculating current in a RC circuit?

• "In order to find current in RC circuit, resistance of only resistor is considered" - This isn't true. Jan 23, 2018 at 13:05
• Looking closely at what you wrote, I see that it is can be true depending on how the circuit is wired, and what you mean by "current in RC circuit". But it is not particularly useful. The current in the resistor is indeed Voltage(resistor)/Resistance(resistor), but this may not be "current in RC circuit". Jan 23, 2018 at 13:53
• Do you mean an RC series connected to a DC source? The voltage across the resistor is affected by the voltage across the capacitor. And you have the concept backwards. The capacitive reactance is an effect built from the basic behavior of the capacitor, $Q=CV_C$. Jan 23, 2018 at 13:56