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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 resistances is

A

`1/R_(100)=1/R_(40)+1/R_(60`

B

`R_(100)=R_(40)+R_(60)`

C

`R_(100)gtR_(60)gtR_(40)`

D

`1/R_(100)gt1/R_(60)gt1/R_(40)`

Text Solution

Verified by Experts

The correct Answer is:
D
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