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JAMB Physics 2004 Question 29

Question 29

Alternating Current Circuits

An a.c. circuit of emf 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor of capacitive reactance 10Ω. The current flow in the circuit is

  1. A.1.4A.
  2. B.14.0A.
  3. C.1.2A.
  4. D.12.0A.
Show the answer and explanation

Answer: C (1.2A.)

Explanation

Z = √(82 + (16 − 10)2) = 10 Ω, so I = 12/10 = 1.2 A.