Class 9

Memory Computer memory refers to the storage device which stores data, instructions required during the processing of data, and also the output results. Computer use two types of storage memories:…

Computer software Computer software refers to a set of programs, data, and instructions that enable a computer to perform specific tasks or functions. Software can be broadly categorized into two…

Computer system  A computer system is a set of integrated devices that input, output, process, and store data and information. Computer systems are currently built around at least one digital…

Computer A computer is an advance electronic machine that accepts input from the users, processes the given data by performing defined operations on it, and generates the output in the…

Introduction to AC and DC Alternating Current (AC): AC is an electric current that periodically reverses direction. Unlike direct current (DC), where the flow of electric charge is only in…

Magnet: A magnet is substance or object that has property to attract magnetic materials. A magnet has following properties: It has two poles north and south poles. It is assumed…

Introduction to cell A cell is a single electrical energy source which uses chemical reactions to produce a current. A cell can be classified as a reserve, wet or dry…

Introduction to electric power James Joule (1818-1889), an English scientist, confirmed Ohm's Law and discovered that a conductor's ability to produce heat is directly proportional with both its resistance and…

Introduction to Electric circuit:  An electric circuit is a path in which electrons from a voltage or current source flow. The simplest electric circuit consists of three primary components: a…

Voltage The electric force known as voltage is what moves the free electrons from one atom to another. Voltage is a unit of measurement for the electrical energy differential between…