There are a few electrolyte abnormalities: hypokalemia, hypercalcemia, hyperkalemia and hypocalcemia. Hypokalemia is also referred to as low potassium. The main cause is loss of potassium in urine due to diuretic medicines. Diarrhea and vomiting can also contribute to hypokalemia.
The name of the first camera is camera obscura and is described to be the foundation on which most modern cameras are based on. Johann Zahn made the first camera, in 1685.
The video camera as it is known today is able to record images and sound. The first demonstration of this capability took place on 14 April 1956. Ray Dolby, Charles Ginsberg, and Charles Anderson invented the first machine to record both images and sound.