When an electrical circuit is connected to a 12 V AC source, it draws 0.2 A. Connected to a 12 V DC source, it draws 0.4 A. Which of the following combinations can produce this behaviour?
Options

Question

When an electrical circuit is connected to a 12 V AC source, it draws 0.2 A. Connected to a 12 V DC source, it draws 0.4 A. Which of the following combinations can produce this behaviour?

G1 Physics · Accepted Answer

Step 1: From AC data, impedance Z = V(RMS)/I(RMS) = 12/0.2 = 60 Ω. Step 2: From DC data, current after transients is 0.4 A, so ohmic R = 12/0.4 = 30 Ω. Step 3: DC flows at steady state, excluding a series capacitor; the extra AC impedance is inductive. Therefore a series LR circuit, option A. Final answer: (A) Series LR.