None. Power measured in watts is calculated by a number of equations, one which is probably useful to you is P=V x I (Voltage x Current) So you could say 1W = 1V x 1A.
http://wiki.answers.com/Q/How_many_watts_equal_1_v...

Volts and Watts are completely different. A Volt is electric potential. Watt is power,
http://www.chacha.com/question/howmanywattsequa...

Depends on the Current. P=IV. All you have is Voltage (V) you need the Current (I) to get to your answer.
http://answers.yahoo.com/question/index?qid=201009...

The conversion of Watts to Volts is governed by the equation Volts=Watts/Amps.
http://www.kgbanswers.com/howmanywattsarein1...
