🔍 Key Concepts

• Ohm’s Law for AC circuits using impedance: I = V / Z • Difference between impedance (Z) and resistance (R) • Unit relationships: volts (V), ohms (Ω), amperes (A)

💭 Think About

• If you know the voltage across a component and its impedance, how can you relate these to find the current? • What happens to the current when impedance increases, if the voltage stays the same? • Roughly, is the current likely to be a very small fraction of an ampere, less than an ampere, or extremely large for a 120 V circuit with 200 Ω impedance?

✅ Before You Answer

• Be sure you are using impedance (Z) in ohms directly in the current formula, not power or frequency. • Carefully divide 120 volts by 200 ohms and check your decimal placement. • Confirm that your final answer’s order of magnitude makes sense for household-level voltage and a 200 Ω load.