A sound bar typically consumes 20-50 watts of electricity. However, if you have additional devices like subwoofers and rear speakers, the wattage will increase. It is important to note that leaving a sound bar on all the time can have negative consequences. It can cause the sound bar to overheat, pose a fire hazard, and unnecessarily use up energy. This can also shorten the lifespan of the sound bar. Therefore, it is recommended to turn off the sound bar when it is not in use to save electricity and prevent any potential damage.