When a certain a c supply is connected to a lam... - JAMB Physics 2006 Question
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 option: a
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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