Two 220V, 100W bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220V AC supply line. The power drawn by the combination in each case respectively will be:
Text Solution
Verified by ExpertsThe correct answer is:
B
P 1 = 100W, P 2 = 100W, V = 220 volt
P 1 = 
, P 2 = 
∴ R 1 = 
= 
= 
R 2 = 
= 
= 
Ω Ω
Case I: When two bulbs are connected in series.
In series, R eq = R 1 + R 2
= 
× 2
, Hence, P eq = 
= 
= 
= 50W
Case II: When two bulbs are connected in parallel.
In parallel,
R eq = 
= 
R eq = 
× 
Hence, P eq = 
= 
= 200W
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