Electric motors and generators
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is a device that produces electricity through electromagnetic induction. Electromagnetic induction is the process of generating electric current with a magnetic field. Generators may produce either alternating or direct current, but they all change kinetic energy to electrical energy.
Tharshini Ravikumar
Technological awareness
As the popularity of social networking sites continues to grow, so do the security risks associated with them. ... Because of the threat posed by cyber criminals, taking it upon yourself to secure your social networking accounts is of the utmost importance.
Networking devices and hardwares
A connectivity device to which network cables are attached to form a network segment. Hubs typically do not filter data, but instead retransmit incoming data packets or frames to all parts. Almost all networks today use a central hub or switch to which the computers on the network connect. Computer hardware is the collection of physical parts of a computer system. This includes the computer case, monitor, keyboard, and mouse.
Classification of microbes
Microbiology is the study of microscopic organisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). ... Bacteria, fungi, viruses, protozoa, and algae are the major groups of microorganisms. The vast majority of microorganisms are not harmful but rather beneficial. a microorganism, especially a bacterium causing disease or fermentation is a microbe.
Evaluation of disinfectant
A method to evaluate the cleaning and disinfectant action of surface disinfectants. ... Surface disinfection tests, used to evaluate new disinfectants, do not take into account the effects of detergents or of the mechanical cleaning process. The disk-diffusion method is used to test the effectiveness of a chemical disinfectant against a particular microbe. The use-dilution test determines the effectiveness of a disinfectant on a surface. In-use tests can determine whether disinfectant solutions are being used correctly in clinical settings.
Typhoid
Typhoid fever is caused by Salmonella typhi bacteria. Typhoid fever is rare in industrialized countries. However, it remains a serious health threat in the developing world, especially for children. Typhoid fever spreads through contaminated food and water or through close contact with someone who's infected.
Water pollution
Water pollution is the contamination of water bodies, usually as a result of human activities. Water bodies include for example lakes, rivers, oceans, aquifers and groundwater. Water pollution results when contaminants are introduced into the natural environment.
Cholera
Cholera is a bacterial infection that causes diarrhea. The cholera bacterium is usually found in water or food that has been contaminated by feces (poop). Cholera is rare in the US. You may get it if you travel to parts of the world with poor water and sewage treatment.
The doll's House
A Doll's House. A Doll's House opens on Christmas Eve. Nora Helmer enters her well-furnished living room—the setting of the entire play—carrying several packages. Torvald Helmer, Nora's husband, comes out of his study when he hears her arrive.
The arrow and the song
“The Arrow and the Song” As a Representation of Wonder: The poem is a comparison of an arrow shot in the air and a song sung in the open. It shows how both disappear quickly with far-reaching impacts. The poet narrates how he once shot an arrow and sang a song, and it was not possible to locate their flight.
Sympathy - Paul Laurence
The poem Sympathy, written by Paul Laurence Dunbar, Paul is expressing to the readers all of the difficult problems he has encountered in his lifetime. He is relating his life to a bird that is trapped in a cage, while everything around or outside of the cage is growing and living.
How many land does a man need
The protagonist of the story is a peasant named Pahom, who overhears his wife and sister-in-law argue over the merits of town and peasant farm life. He thinks to himself "if I had plenty of land, I shouldn't fear the Devil himself!". Unbeknownst to him, Satan is present sitting behind the stove and listening.