A bulb rated 200W, 
is connected to 
supply. What external resistance should be connected in series to have same power as earlier?
Text Solution
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Rated power of the bulb is 
and operating voltage is 
.
When this bulb is connected in 
supply, we need to ensure the current passing through this bulb is 
by connecting additional resistance
Total resistance required to get 
from 
supply 
Since resistance of bulb is 
, we need to add additional 
resistance in series.
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