What Is Electrical Resistance? Electrical resistance is the hindrance to the flow of charge through an electric circuit. Resistance is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written as a word and sometimes symbolized by the uppercase Greek letter omega. In general, when the applied voltage is … Read more
A control system is a system of devices or set of devices that manages, commands, directs or regulates the behavior of other devices or systems to achieve desired results. There are two main types of control system. They include: Open loop control system Closed loop control system What Is Open Loop Control System? An open … Read more
What Is A Covalent Bond? A covalent bond also referred to as a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is … Read more
Conduction, convection and radiation are the three major ways in which thermal energy can be transferred from one object/substance to another or from a system to its surroundings. Both conduction and convection requires matter to transfer heat. However, if there is a temperature difference between two systems heat will always find a way to transfer … Read more
What Is A Resistor? A resistor is a passive two-terminal electrical component with the primary function of limiting the flow of current in a circuit, a function that is key to the operation of most circuits. They are typically constructed of metal wire or carbon and engineered to maintain a stable resistance value over a … Read more
What Is Substitution Reaction? A substitution reaction is also referred to as a single displacement reaction, single substitution reaction or single replacement reaction. Substitution reaction can be described as a reaction in which the functional group of one chemical compound is substituted by another group or it is a reaction which involves the replacement of … Read more
Hazel Eyes Hazel eyes are sometimes mistaken for green or brown eyes. They are not as rare as green eyes, but are rarer than blue eyes. Only about 5 percent of the population worldwide has the hazel eye genetic mutation. After brown eyes, they have the most melanin. . The combination of having less melanin … Read more
What Is Lone Pair? When two elements of a pair are joined together with the surface contact between them, the joint is referred to as lower pair. Area of two elements comes together when relative motion occurs between the elements to form a lower pair e.g nut and screw, universal joint used to connect two … Read more
Light Waves Light travels as waves. Light waves don’t always require particles to travel through. They can also travel through outer space or a vacuum. Light waves travel in straight lines. You can detect them with your eyes and also with instruments such as camera. They are reflected by mirrors and change direction when they … Read more
What Is An Atom? An atom is the smallest unit of matter that retains all of the chemical properties of an element. Every solid, liquid, gas and plasma is composed of neutral or ionized atoms. An atom is composed of two regions the nucleus which is in the center of the atom and contains protons … Read more