Question

An inductor and a resistor are connected in series across an AC source. Immediately after the switch is closed, which of the following statements is true?

• A. The current in the is $\Delta V/R$
• B. The voltage across the inductor is zero.
• C. The current in the circuit is zero
• D. The voltage across the resistor is $\Delta V$
• E. The voltage across the inductor is half its maximum value.

Answer 1

The correct option is C The current in the circuit is zero

When a power source, AC or DC, is first connected to a RL combination, the presence of the inductor impedes the buildup of a current in the circuit. The value of the current starts at zero and increases as the back emf induced across the inductor decreases in magnitude.