Two identical light bulbs are to be connected to a source with a = 8 V having negligible internal resistance (as shown in figure). Each light bulb has a resistance R= 200. The current and potentialitetence across each bote
E=8V
취 E
1
2.0 12
2.0 Ω
w
Answers
Given : Two identical light bulbs are to be connected to a source with a = 8 V having negligible internal resistance
Each light bulb has a resistance R= 200.
To Find : The current and potential across each bulb
Solution:
case 1 : Bulb connected in series
Identical bulb hence potential will be divided equally
8/2 = 4V across each bulb
current = 4 / 200 = 20 mA
case 2 : Bulb connected in parallel
potential will be same for both bulbs
8 V across each bulb
current through bulb = 8 / 200 = 40 mA
Total current = 40 + 40 = 80 mA
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