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H=V2/R
=>H α 1/R, Potential Difference and time remaining constant
Therefore, heat produced is more if R is less.
R=ρl/A =>R α 1/A
Therefore, heat produced is more if A is more. [Because, R decreases if A increases which in turn produces more heat.]
More heat would produce more light.
Therefore more A would produce more light.
Then why are filaments used in bulb made thin i.e. their A is made less?
Notations:
A-area of cross section
R-Resistance
H-Heat
Ρ-restivity
it depends upon the elements used the tugstun is used which have maximum capacity to withstand the heat and not melt certain temperature is required for it to heat up thats why there is no 100 % guarantee it fuses
because filaments should have high resistance and low melting point
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