Ree identical light bulbs rated 60W at 12 V are connected to a 12-Volt battery a

Question

Ree identical light bulbs rated 60W at 12 V are connected to a 12-Volt battery as shown. Assume that a bulb's brightness is proportional to the power it consumes. Answer "True" or "False" by dragging the correct label into the bin to the left of each statement. Bulb A is brighter than bulb B Bulb B is brighter than bulb C Bulbs B and C together are as bright as bulb A. If bulb C is removed, bulb B will grow brighter than before. If bulb C is removed, bulb A will grow brighter than before. All three bulbs together are as bright as a single 90W bulb connected to the battery. If bulbs B and C are replaced with 100W bulbs, bulb A will put be brighter than before.w If all three bulbs are replaced with identical 100 W bulbs, the new combination will put out more total light than the original 60W combination.

Explanation / Answer

Here,

For the current in the bulb A is sum of current in bulb B and C

1. True , the bulb is brighter than bulb B

2.

as the current in the bulb B and C is same

False .

3. False .

as the brightness = I^2 * R

IA = IB + IC

4. True

if bulb C is removed , current in B will increase.

hence , the bulb will glow brighter

5.False

as the equivalent resistance will increase when bulb C is removed

hence , the bulb A will become dimmer

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