🔍 Key Concepts

• Ohm's Law relationship among voltage, current, and impedance in AC circuits • How to rearrange algebraic equations to solve for different variables • Meaning of impedance (Z) as the AC equivalent of resistance

💭 Think About

• Start from the basic form of Ohm's Law for AC circuits and write it using I, E, and Z • Ask yourself: if you know E and Z, how would you calculate I? Then, if you know I and Z, how would you calculate E? • Think about whether more than one algebraically equivalent form can be correct at the same time

✅ Before You Answer

• Confirm the standard form of Ohm’s Law for AC circuits that uses impedance instead of resistance • Check that each rearranged formula keeps the same variables and units on each side (no typos like Z = Z/I) • Verify whether multiple options can all be algebraically consistent with the same base equation