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JAMB Physics 1981 Question 30

Question 30

Current Electricity

The resistance of an open series circuit is

  1. A.zero
  2. B.half the normal resistance of the circuit
  3. C.double the normal resistance of the circuit
  4. D.one
  5. E.infinite
Show the answer and explanation

Answer: E (infinite)

Explanation

An open circuit has a gap, and no current can flow however large the voltage, so its resistance is effectively infinite.