🔍 Key Concepts

• Capacitive reactance (Xc) and how it depends on frequency (f) • The relationship between reactance, voltage, and current in an AC circuit • How changing frequency affects impedance and therefore current flow

💭 Think About

• Write down the formula for capacitive reactance and identify what happens to Xc when frequency increases • Think about Ohm’s law for AC (using reactance instead of resistance): if reactance changes while voltage stays the same, what happens to current? • Decide whether a change in frequency could ever leave both current and capacitive reactance completely unchanged

✅ Before You Answer

• Be sure you know the exact formula for capacitive reactance Xc in terms of frequency (f) and capacitance (C) • Check whether an increase in frequency makes Xc get larger or smaller • From your conclusion about Xc, determine whether the average current must increase, decrease, or stay the same for a fixed supply voltage