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JAMB Physics 1992 Question 46

Question 46

Alternating Current Circuits

In A.C. circuit theory, the root mean square (r.m.s) current, Irms, and the peak (maximum) current Io are related by

  1. A.Io = Irms/√2
  2. B.Irms = Io/√2
  3. C.Irms = 1/Io √2
  4. D.Io = 1/Irms √2.
Show the answer and explanation

Answer: B (Irms = Io/√2)

Explanation

For a sinusoidal current the r.m.s. value is the peak value divided by √2 (about 0.707 Io).