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.
The kidneys remove urea from the blood through tiny filtering units called nephrons. What are the major organs of the urinary system? Their function is to remove liquid waste from the blood in the form of urine; keep a stable balance of salts and other substances in the blood; and produce erythropoietin, a hormone that aids the formation of red blood cells. The kidneys remove urea from the blood through tiny filtering units called nephrons. How does the kidney form urine? Blood from the heart comes into your kidneys from the renal arteries where it enters about 2-3 million nephrons per kidney.