Find the energy given from a lightbulb

[AnomalyCoder]

Homework Statement

You have two light bulbs: Bulb A is rated at 25 Watts and Bulb B is rated at 100 Watts. You plug it into a standard light socket that provides a voltage difference of 120 volts.
Which light bulb will use more energy during the same period of time? How many more?

Bulb A = 25 Watts
Bulb B = 100 Watts.

Homework Equations

Watts = Joules/Seconds

The Attempt at a Solution

Bulb A : 25 = Joules/10 seconds , you end up with 250 = x
Bulb B : 100 = Joules/10 seconds , you end up with 1000 = x
Bulb B, 4 times more energy.

The only questions I really have about this are:
Did I get the right solution?
Why was the voltage difference of 120 volts included in the problem for?
Is it just irrelevant information designed to trick an innocent student?

 

[rock.freak667]

The only other reason I can think of giving you V= 120V is if you decide to compare the currents that each use. In which you will still get that bulb B uses more, since its power output is 100W.

 

[AnomalyCoder]

Oh that makes sense.
Thank you for the quick reply!