An incandescent lightbulb rated at 60 W will dissipate 60 W as heat and light when connected across a 100 V ideal voltage source. A 100-W bulb will dissipate 100 W when connected across the same source. If the bulbs are connected in series across the same source, determine the power that either one of the two bulbs will dissipate.
Find:
The power dissipated by the series of the two light bulbs.
Assumptions:
The resistance of each bulb doesn’t vary when connected in series.
When connected in series and assuming the resistance of each bulb remains the same as when connected individually:
Notes: 1.It’s strange but it’s true that a 60 W bulb connected in series with a 100 W bulb will dissipate more power than the 100 W bulb. 2. If the power dissipated by the filament in a bulb decreases, the temperature at which the filament operates and therefore its resistance will decrease. This made the assumption about the resistance necessary.
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