Electronic switch. In electronics, an electronic switch is an electronic component or device that can switch an electrical circuit, interrupting the current or diverting it from one conductor to another. Typically, electronic switches use solid state devices such as transistors, though vacuum tubes can be used as well in high voltage applications.
You may need to switch between types of shampoos if one type controls the dandruff at first but later loses its effectiveness. How often you should use dandruff shampoo varies from daily to a couple of times a week. Check the directions on the bottle. When shampooing your hair, rub the shampoo into your scalp well. Leave the shampoo on your head for 5 minutes, or as directed, before you rinse.
1 It is thought to be caused by an overproduction of oil by the skin, and it is called dandruff when it affects the scalp. 2  Dandruff looks like thick, falky, white to yellowish localized patches of scale, and can occur together with red, irritated skin.