Final answer:
The RMS current in an AC circuit with a capacitor can be calculated using Ohm's Law for capacitive reactance.
Step-by-step explanation:
In an AC circuit with a capacitor, the RMS current is limited by the capacitor's effective resistance to AC. This is given by another version of Ohm's law. The formula to calculate the RMS current I in a circuit containing only a capacitor C is:
I = V / XC
Where V is the rms voltage across the capacitor and XC is the capacitive reactance. Capacitive reactance can be calculated using the formula:
XC = 1 / (2πfC)
Where f is the frequency of the AC voltage and C is the capacitance of the capacitor.