Incandescent bulbs are designed by keepi...

Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100W, 60W, and 40W bulbs have filament resistances `R_(100), R_(60), and R_(40)` , respectively. the relation between these resistance is

`1/R_100=1/R_40+1/R_60`

`R_400=R_40+R_60`

`R_100gtR_60 gtR_40`

`1/R_100 gt1/R_60 gt 1/R_40`

Text Solution

Verified by Experts

`R=V^2/P or R prop 1/P implies 1/R_(100) gt 1/R_(60) gt 1/R_(40)`

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