Question
Download Solution PDFTwo electric lamps have filaments of the same metal having the same thickness. If one of them gives 100 watt and other gives 500 watt across the same supply, then:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
When two lamps are connected in parallel (same supply), the power of each lamp is given by:
The resistance is given by:
where, ρ = Resistivity
l = Length
A = Area
Calculation
From the above expression, for the same metal having the same thickness, the power is inversely proportional to length.
Hence, a 100-watt lamp filament has a longer length than a 500-watt lamp.
Last updated on Jul 1, 2025
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