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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) gt R_(60) gt R_(40)`

D

`1/R_(100) gt 1/R_(60) gt 1/R_(40)` .

Text Solution

Verified by Experts

The correct Answer is:
D
d. Power `prop 1/R`.
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