Alternating current

Class 12 · Physics · 5 questions

Name: ____________________   Date: ____________

1. The rms value of an AC with peak value 10 A is:

   • A 14.1 A
   • B 7.07 A
   • C 10 A
   • D 5 A

2. In a purely resistive AC circuit, the current and voltage are:

   • A 180 degrees apart
   • B 90 degrees apart
   • C Unrelated
   • D In phase

3. Capacitive reactance is given by:

   • A 2 pi f L
   • B 2 pi f C
   • C 1 / (2 pi f L)
   • D 1 / (2 pi f C)

4. Inductive reactance:

   • A Increases with frequency
   • B Decreases with frequency
   • C Is zero always
   • D Does not change

5. At resonance in a series LCR circuit, the impedance is:

   • A Infinite
   • B Minimum and equal to R
   • C Maximum
   • D Zero