When a certain a.c supply is connected to a lamp, it lights with the same…

When a certain a.c supply is connected to a lamp, it lights with the same brightness as it does with a 12 V d.c battery. Then r.m.s value of the a.c supply is?
  • A.
    12.0 V
  • B.
    3.5 V
  • C.
    17.0 V
  • D.
    8.5
Correct Answer: Option A
Explanation

The r.m.s value of an a.c voltage/current is the value of the d.c. voltage/ current that will dissipate the same amount of energy in a given resistance as the a.c. Thus the r.m.s value of the a.c supply is 12v.

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PT is a tangent to the circle TYZX. YT = YX and o. Calculate A. 50o B. 65o…
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