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
Which of the following statements about X-rays is correct? X-rays ...
A lamp is rated 240V 60W, calculate the resistance of its filament ...
Which of the following statements is NOT correct? ...
The energy required to change a solid to liquid at constant temperature is called ...
Which of the following statements about the universal gravitational constant, G, is true? ...
Electrons passing through crystals are diffracted because they ...