Q:

What does the 'watt' specified for a motor mean?

What does the watts specification on a motor mean?
For example, there are motors with "power: 1500 watts" written on them. Does this mean that motor is capable of output power of 1500 watts? 
And what is an 'LBC 05' series motor?
And if I wanted to drive two wheels of a car (x kg car) what are the factors that I will need to keep in mind while selecting the motor? Does the car weight matter?
Thank you. I am a newbie to this and trying to build an electric car :) Any help will be appreciated. 
 EDIT : P.s Please what are poles of a motor ?

A:

International standards require the rated output mechanical power to be marked on a motor's rating plate. That would suggest that a motor with "1500 watts" marked on it should be capable of delivering 1500 watts of mechanical power to a load. However there is no guarantee that any particular motor conforms to international standards un less the literature or rating plate indicates that the motor conforms to IEC, NEMA or some other international standard. There may be also a marking on the motor that indicated whether or not it is rated for continuous duty. A 1500 watt motor rated for continuous duty should be capable of delivering 1500 watts of mechanical power 24 hours per day, 365 days per year.
A motor's frame size usually designates the physical dimensions, particularly the mounting and shaft dimensions. A given motor frame size can accommodate a range of speed, and power ratings. The torque rating for a given frame size may vary, but over a smaller range than the speed and power ratings.

