The resistance of a 40W car head lamp, drawing current fr...
The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
0.3Ω
3.3Ω
3.6Ω
4.8Ω
Correct answer is C
Power delivered to head lamp = V2R
= 40W
R = V240
= (12×2)40
= 3.6Ω
In which of the following media is the speed of sound the least? ...
The region around a magnet in which magnetic force can be expressed is known as ...
Which of the following radiations has it's frequency lower than that of infrared radiation? ...
A metal of volume 40 cm3 is heated from 30 °c to 90 °c, the increase in volume is ...
A body accelerating will have a constant speed if it is ...
The pin-hole camera produces a less sharply defined image when the ...