A `25W-120V` bulb and a `100W-120V` bulb are connected in series across `120V` line. Which bulb will be brighter?

Options

A. 25W-120V
B. 100W-120V
C. both will have the same incandescence
D. neither will give any light

Answer

A

Explanation

`R_(1) = (120^2)/(25) , R_(2) = (120^2)/(100)`
`R_(1) gt R_(2)`
`P_(1) = i^2 R_(1) , P_(2) = i^(2)R_(2)`
`P_(1) gt P_(2)`.