Importance of Maximising the Efficiency of Devices  A device is a tool or an equipment constructed for a specific purpose. An electric drill is a device used to drill holes. A forklift is constructed to lift heavy objects vertically.A device converts in…

Describe Domestic Electric Circuits1. Main board : It is provided outside the building under a covered place (varandah or poarch). It contains the meter (energy–meter) and the main switch. From the street electric pole a thick rubber insulated cord reac…

Understanding GravityWhen a boy accidentally drops a book from his hand. The book is pulled towards the Earth by the force of gravity. Fig. The book dropped by the boy is pulled towards the EarthThe force of gravity on the Earth is caused by a gravitati…

How would you Describe the Image Formed by a Plane MirrorReflection from the Plane Mirror  Relation between the distances of the object and the image from the plane mirror  is that they are equal. To verify this, consider the geometrical construction sh…

Applications of Total Internal ReflectionFibre Optics Total internal reflection is also used in optical fibres. An optical fibre consists of an inner core of high refractive index glass and surrounded by an outer cladding of lower refractive index.When l…

List Out Different Electric SymbolsMany different kinds of equipments or components are used in setting up electrical circuits. To draw the diagrams of electrical circuits on paper these equipments/components are shown by their symbols. Here are some sym…

What is meant by Alternating CurrentAlternating current (AC) The electric current which changes its direction (or polarity) after a certain fixed interval of time is called alternating current or AC. Thus, in AC, the polarity (+ or –) is not fixed. The e…

How is the Image Formed by a Spherical Mirror?Image formation by Spherical mirror in different cases Introduction: From mirror formula, we find that for a mirror of a fixed focal length f, as object distance u changes, image distance n also changes.Imag…

What is the Magnetic FieldLines of Magnetic field (Magnetic lines of force)  Definition : A magnetic line of force, is a line straight or curved, in the magnetic field of a magnetic pole of magnetic dipole, such that the tangent at any point of this lin…

How do you Determine the Direction of the Magnetic FieldMagnetic field due to current carrying wire1. Straight wire : It means that when the current flows in a straight wire, the magnetic field produced has circular lines of force surrounding the wire, h…