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JAMB Physics 1999 Question 35

Question 35

Alternating Current Circuits

In the series a.c circuit shown above, the p.d across the inductor is 8 V r.m.s. and that across the resistor is 6 V r.m.s. The effective voltage is

Diagram for this question
  1. A.2 V
  2. B.10 V
  3. C.14 V
  4. D.48 V
Show the answer and explanation

Answer: B (10 V)

Explanation

The inductor and resistor voltages are 90° out of phase, so V = √(82 + 62) = 10 V.