![]() When light falls on such a semiconductor the bound electrons get the light energy from the incident photos. The light dependent resistor uses high resistance semiconductor material. ![]() ![]() It is also called as “Photo Resistor” or “Photo conductor” The light dependent resistor is an electronic component whose resistance decreases with increasing light intensity. This collector current flows to the LED and is responsible for turning the LED on. ![]() This results in high current flowing from the transistor’s collector to the base. As it gets darker in the room, the voltage on the base will increase until the transistor is forward biased. The LDR controls the voltage on the transistor’s base. Resistance decreases (conductivity increases) as light levels increase because there are more charge carriers in the material. More light produces more electron – hole pairs in the material, making the material a better conductor in light. The resistance of the LDR changes as the light level changes. The Light Dependent Resistor (LDR) is made from a Cadmium-Sulfide compound (CdS). Gina's manager now explains the different types of hot air ovens. ![]() This depends on when the equipment needs to be available again. The ovens useconductionto sterilize items by heating the outside surfaces of the item, which then absorbs the heat and moves it towards the center of the item.The commonly-used temperatures and timethat hot air ovens need to sterilize materials is 170 degrees Celsius for 30 minutes, 160 degrees Celsius for 60 minutes, and 150 degrees Celsius for 150 minutes.Hot air ovens sterilize equipment over long periods of time, so she has to be organized in determining what items will be sterilized at what time. Examples of items that aren't sterilized in a hot air oven are surgical dressings, rubber items, or plastic material.Items that are sterilized in a hot air oven include:Glassware (like petri dishes, flasks, pipettes, and test tubes)Powders (like starch, zinc oxide, and sulfadiazine)Materials that contain oilsMetal equipment (like scalpels, scissors, and blades)Hot air ovens use extremely high temperatures over severalhours to destroy microorganisms and bacterial spores. Moist heat sterilization uses water to boil itemsor steam them to sterilize and doesn't take as long as dry heat sterilization. 11Hot Air Oven for Sterilization: Definition & Working PrincipleHot Air Oven for Sterilization: Definition & Working PrincipleSaif Aldeen Saad air ovenis a type of dry heat sterilization.Dry heatsterilization is used on equipment that cannot be wet and on material that will not melt, catch fire, or change form when exposed to high temperatures. ![]()
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