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?

chijioke7

7 years ago

The Vrms is the D.C Equivalent of an Alternating current and it is clearly stated in the question. So the answer is 12V
One has to be very careful when solving jamb questions

Hauwababy16

4 years ago

Someone should explain this question to me🥺🙏🏻

Gddhhcv

2 years ago

My school the answer is 8.5 V not 12.0
According to my own solving
12² = 144
2π/144 = 72
√72 = 8.48 approximately 8.5 😕

Ayinlabenten

2 months ago

it is meant to be 8.5v

exboyteesquare

12 years ago

You people are very wrong in solving your questions sometimes lyk dis question in particular V r.m.s=peakV/square root of two....and rhe right answer is 8.5

Wisdom Francis

11 years ago

Nawaoh!!!!! The answer should be

Vrms= peak V/root2 =8.5