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JAMB Physics 1978 Question 32

Question 32

Capacitors

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 ohm resistor. The total resistance of the combination is

  1. A.10 ohms
  2. B.1 ohm
  3. C.zero
  4. D.20 ohms
  5. E.infinite.
Show the answer and explanation

Answer: E (infinite.)

Explanation

Once charged, a capacitor lets no steady direct current through, so it acts like an infinite resistance in a d.c. circuit.