Q.No.150: - A certain flash-light can use a
10ohm bulb or a 5ohm bulb. Which bulb should be used to get the brighter light?
Which bulb will discharge the battery first?
Ans: - If the bulbs are
connected in parallel then they will have same brightness because the
brightness depends upon the voltage. If the bulbs are connected in series then
first bulb will be brighter than the second because in series the voltage drop
is different in two bulbs. The bulb which has more resistance will discharge
the battery soon.
2 comments:
but the bulb with less resistance have more current flowing through it ,so it will be brighter as well as it will discharge the battery first .....hence the answer for both question is 5 ohm bulb
Part 1.
The 5 Ohm bulb will produce the brighter light.
Brightness is proportional to power.
V is pretty much the same for both bulbs.
Power = V^2/R
[V^2/(5 Ohm)] > [V^2/(10 Ohm)]
Part 2.
The 5 Ohm bulb will discharge the battery of the flashlight faster than the 10 Ohm bulb will.
Current = V/R
[V/(5 Ohm)] > [V/(10 Ohm)]
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