The voltage delivering 1 watt depends on how many amps are present. We use watts to measure power (P), and amps (I) times volts (E) equals watts.
The liver and the production of urea Urea is a nitrogen-containing substance which is produced in the liver, in order to deal with excess amino-acids in the body, which is a natural consequence of the fact that we almost always eat more protein than our body needs to assimilate. The process is called deamination.
The urea is then removed from the body by the kidneys, in a separate process. As urea is produced, it leaves the liver in the bloodstream and passes via the system to all parts of the body. If it builds up, it may have the effect of a on the body.