In the following figure , grade the bulb in order of their brightness :

Explanation

`P_("rated")=(V_("reted")^(2))/(R)`
`R=(V_("rated")^(2))/(P_("rated"))`
`thereforeR_(3)gtR_(2)gtR_(1)`
Power `=i^(2)R`
As current passing through every bulb is same
`therefore` Brightness order is `B_(3)gtB_(2)gtB_(1)`