Knowledge N Fact4u

RECTIFIER CIRCUIT:- Since a diode has the characteristic of having a much greater conductivity in one direction than in the other, it will produce a direct component of current when connected in series with an alternating voltage and a load. This process is known as rectification and is the main use to which diodes are put. There are numerous applications for rectification, e.g. driving a d.c. motor from a.c. mains and the production of direct-voltage supplies for electronic amplifiers . HALF WAVE RECTIFIER:- While alternating currents and voltages play the leading roles in most electrical and electronic equipment, nevertheless many devices can either only operate on unidirectional currents and voltages, or at least they require such a supply as part of their mode of operation. The process of obtaining unidirectional currents and voltages from alternating currents and voltages is termed  rectification. When the applied voltage acts in the forward direction, there is no voltage drop...

The  Mpemba effect  is a process in which hot water  can freeze  faster than cold water. The phenomenon is temperature-dependent. There is disagreement about the parameters required to produce the effect and about its theoretical basis. However, even with this definition it is not clear whether "freezing" refers to the point at which water forms a visible surface layer of ice; the point at which the entire volume of water becomes a solid block of ice; or when the water reaches 0 °C (32 °F). A quantity of water can be at 0 °C (32 °F) and not be ice; after enough heat has been removed to reach 0 °C (32 °F) more heat must be removed before the water changes to solid state (ice), so water can be liquid or solid at 0 °C (32 °F). With the above definition there are simple ways in which the effect might be observed. For example, if the hotter temperature melts the frost on a cooling surface and thus ...

Why do my eyes glow red in photos? Because there is a devil hidden in you.Really😂😂 ••It happens because of blood vessels in our eyes and pupil. Pupil is a small opening whose size is adjusted by the circular muscle called iris. ••In bright light, the iris contracts making the pupil smaller, thus allowing less light to enter into our eyes. ••In dark, the iris relaxes making the pupil larger, thus allowing more light to enter and also exposing the blood vessels in our eyes. ••Hence, when we take a photo in such a dark environment, the flash of light from the camera floods into our eyes at once. ••Some of this light gets reflected from the blood vessels onto the camera before our iris can contract, making our eyes glow red in photos.

Why does popcorn pop? Because popcorn is a pop dancer. No.😂😂😂 ••There are a variety of corns such as field corn, sweet corn and popcorn. However, popcorn is the only corn that pops. Why? ••There are three things in a popcorn seed or kernel that work together to form a perfect popcorn. ••Those are an impermeable shell called pericarp, right water content and starch. When we heat popcorn kernels, the water inside them forms steam and starts to expand, while the starch turns into a gel-like substance. Being enclosed, the expanding steam applies pressure on the shells. ••Eventually, when the shells cannot hold the pressure, they burst open releasing the steam and gel. When this gel comes in contact with air, it rapidly solidifies forming fluffy popcorn.

•Wild dogs bury their food to hide it and save for later, so that other animals can't get to it.  •But, the domesticated dogs have plenty of food, there are a few reasons, why they're still burying things.  •Dogs are domestic animals, doesn't mean that they lose the urge.  •The second reason could be that their owner is giving them too much food/toys and the dog wants to save it for later.  •Another reason could be that, it is a game to them.  If your dog wants your attention or it is bored, they may steal valuable items from you (such as shoe or TV remote), in order to get you to play with them.