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JAMB Physics 2002 Question 46

Question 46

Alternating Current Circuits

Which of the following graphs shows the correct vector diagram for the circuit above?

Diagram for this question
  1. A.Diagram A
  2. B.Diagram B
  3. C.Diagram C
  4. D.Diagram D
Show the answer and explanation

Answer: D (Diagram D)

Explanation

In an inductor–resistor circuit VR is in phase with the current I, and VL leads I by 90°. Diagram D shows VR along I and VL at right angles, ahead of it.