What is the Purpose of an Electrical EarthEarthing Definition : Connecting the metallic body of a high powered electrical appliance (e.g. electric iron, refrigerator, oven, etc.) to the earth wire of domestic circuit, is called ‘earthing’. In three pin …

Flow Of Current In A MetalFlow of electric current  Three basic conditions are required for an electric current to flow. A device used to produce an electric current like cell, battery, or a plug point acting as a source. A wire made of a metal like cop…

Measurement of Length The distance of something from one end to the other is called length. It can be measured using a ruler, a measuring tape, a metre rod, and so on, whichever is convenient for the required purpose. While measuring length using a rule…

Classification Of Wave MotionOn the Bases of Necessity of Medium RequiredMECHANICAL WAVES The wave which propagates only in a material medium are called elastic or mechanical waves. Example: Sound waves, Water waves (ripples), Waves on stretched strings,…

What is a Switch in an Electrical CircuitElectric switch We use electric switches to put on or off the electrical devices and machines. But do you know how it works? An electric switch is a device that is used to open or close an electric circuit. When …

Kinetic Molecular Theory of GasesThe Properties of a Gas A student explores the properties of some air in a round bottom flask as shown in Figure. He noted the temperature, θ1, and pressure, P1, of the air. When the flask was immersed in hot water as sh…

What is Nature of LightLight is a form of energy (optical energy) which helps us in seeing objects by its presence.Theories about nature of light : 1. Particle nature of light (Newton’s corpuscular theory) : According to Newton light travels in space wi…

The Uses of Lenses in Optical DevicesSimple MicroscopeA magnifying glass is the simplest microscope. It consists of a single convex lens with short focal length.When the magnifying glass is held near to the eye and the object is placed inside its focal …

Applications of Reflection of Light in Daily LifeMeters like ammeters and voltmeters use a mirror to avoid parallax error. The reading is taken from a position such that the image of the pointer is directly under the pointer. The wing and rear-view mirr…

Is an Image formed by Reflection Real or VirtualIncident rays starting from a point object, and reflected from a mirror, either actually meet at or appear to come from a point. The other point is called the image of the point object.Real Image Virtual I…