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 urea and water that make up urine are removed from the blood in  the kidney. This is then passed on to the bladder which will be  excreted as urine.
1 Your liver produces ammonia â which contains nitrogen â after it breaks down proteins used by your body's cells. 2  The nitrogen combines with other elements, such as carbon, hydrogen and oxygen, to form urea, which is a chemical waste product.  The urea travels from your liver to your kidneys through your bloodstream.