When a certain a.c supply is connected to a lamp, it lights with the same brightness as it does with a 12v d.c battery. The r.m.s value of the a.c supply is
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Expert's answer
2019-09-02T09:26:22-0400
The same brightness means the same heat dissipation power, so that the rms value of the AC voltage is equal to the DC voltage, i.e. 12 V.
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