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JAMB Physics 2008 Question 2

Question 2

Measurement and Units

I. Force (N) II. Torque (Nm−1) III. Current (A) IV. Power (W)
Which of the above are the correct S.I. units of the quantities indicated?

  1. A.I and II only
  2. B.I and III only
  3. C.I,II and III only
  4. D.I, III and IV only
Show the answer and explanation

Answer: D (I, III and IV only)

Explanation

Force in newtons, current in amperes and power in watts are correct. Torque is force × distance, so its unit is N m, not N m−1.