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.
Since ammonia is not a healthy thing to have in high amounts in your body, it is processed by the body into urea. Urea is then carried in the blood to the kidneys where it is removed and filtered out in the urine. Blood Urea Nitrogen is an indicator of how much ammonia is being transferred into urea.