Two 40 W (120 V) lightbulbs are wired in series, then the combination is connected to a 120 V supply. Part A How much power is dissipated by each bulb

The power dissipated by each bulb is  

Explanation:

From the question we are told that

    The  power rating of both bulbs is  

     The voltage  rating of both bulb is  

     The  both bulbs are connected a voltage of  

The amount of power rating of each  bulb is mathematically represented as

=>    

substituting values

Now given that the bulbs are connected is  series, the equivalent resistance is  evaluated as

substituting values

The  current flowing through the bulbs is mathematically evaluated as

substituting values

Now  the power dissipated by both bulbs is mathematically represented as

substituting values