passwella.
Menu

JAMB Physics 2001 Question 45

Question 45

Alternating Current Circuits

At resonance, the phase angle in an a.c. circuit is

  1. A.90°
  2. B.60°
  3. C.0°
  4. D.180°
Show the answer and explanation

Answer: C (0°)

Explanation

At resonance XL = XC, so the circuit acts like a pure resistance and current and voltage are in phase: cos θ = R/Z = 1, θ = 0°.