The bulb of a motorcycle head-lamp is marked 40W, 6V. The...
The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is
62402ohms
4062ohms
406ohms
6 x 40 ohms
6240ohms
Correct answer is E
Power V2R
40 = 6×6r
R = 3640Ω
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