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JAMB Physics 1983 Question 43

Question 43

Current Electricity

Four equal resistors R1, R2, R3 and R4 are connected in series as shown in Fig. 9 below. V1, V2 and V3 are voltmeters connected as indicated. Which of the following relations is CORRECT?

Diagram for this question
  1. A.V1 = V3 = V2/2
  2. B.V1 = 2V2 = V3
  3. C.V1 = ½V3 = V2
  4. D.V1 − V3 = V2
  5. E.V2 − V1 = V3/2
Show the answer and explanation

Answer: A (V1 = V3 = V2/2)

Explanation

The same current flows through four equal resistors, so each has the same p.d. V1 and V3 each read across one resistor, while V2 reads across two, so V1 = V3 = V2/2.