Post Views: 2 DEFINITION AND CONCEPT Electromagnetic waves are produced by electromagnetic vibrations. Electromagnetic waves have electrical origin and the ability to travel in vacuum. So, electromagnetic waves are regarded… Read More »ELECTROMAGNETIC WAVES
Post Views: 4 Conductors, insulators and semi-conductors i) An insulatoris a material or object which resists flow of heat (thermal insulator) or electrical charges (electrical insulators). Examples are paraffin, wood,… Read More »ELECTRONICS
Post Views: 6 Introduction Radioactivity was discovered by Henri Becquerel in 1869. In 1898, Marie and Pierre Curie succeeded in chemically isolating two radioactive elements, Polonium (z=84) and Radium (z=… Read More »RADIOACTIVITY
Post Views: 14 Photoelectric effect was discovered by Heinrich Hertz in 1887. Photoelectric effect is a phenomenon in which electrons are emitted from the surface of a substance when certain… Read More »PHOTOELECTRIC EFFECT
Post Views: 6 Electromagnetism is the effect resulting from the interaction between an electric current and a magnetic field. This effect brings about induced electromagnetic force (e.m.f) and the resulting… Read More »ELECTROMAGNETIC INDUCTION
Post Views: 6 What is Electromagnetic?. Electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. It includes visible light, ultra-violet rays, microwaves, X-rays, radio… Read More »ELECTROMAGNETIC SPECTRUM
Post Views: 7 Introduction Circular motion is the motion of bodies travelling in circular paths. Uniform circular motion occurs when the speed of a body moving in a circular path… Read More »UNIFORM CIRCULAR MOTION
Post Views: 6 Any object in a liquid whether floating or submerged experiences an upward force from the liquid; the force is known as upthrust force. Upthrust force is also… Read More »FLOATING AND SINKING
Post Views: 7 Pressure law This law states that “the pressure of a fixed mass of a gas is directly proportional to the absolute temperature if the volume is kept… Read More »THE GAS LAWS
Post Views: 3 What is heat?. Heat is a form of energy that flows from one body to another due to temperature differences between them. Heat capacity Heat capacity is… Read More »QUANTITY OF HEAT
Post Views: 8 When current flows, electrical energy is transformed into other forms of energy i.e. light, mechanical and chemical changes. Factors affecting electrical heating Energy dissipated by current or… Read More »HEATING EFFECT OF AN ELECTRIC CURRENT
Post Views: 3 Electric fields An electric field is the space around a charged body where another charged body would be acted on by a force. These fields are represented… Read More »ELECTROSTATICS
Post Views: 1 Electric potential difference and electric current Electric current: Electric potential difference (p. d) is defined as the work done per unit charge in moving charge from one… Read More »CURRENT ELECTRICITY
Post Views: 4 Newton’s first law (law of inertia) This law states that “A body continues in its state of rest or uniform motion unless an unbalanced force acts on… Read More »NEWTON LAWS OF MOTION
Post Views: 2 Introduction Refraction is the change of direction of light rays as they pass at an angle from one medium to another of different optical densities. Exp. To… Read More »REFRACTION OF LIGHT
Post Views: 3 Fluid in physics refers to liquids and gases. To study fluid flow we have to make the following assumptions: We consider fluids to be incompressible We assume… Read More »FLUID FLOW
Post Views: 5 Introduction: Oersted’s discovery. Hans Christian Oersted discovered the magnetic effect of a current in 1819. The direction of the field is dependent on the direction of the… Read More »MAGNETIC EFFECT OF AN ELECTRIC CURRENT
Post Views: 2 Measuring length using vernier callipers. Vernier callipers is used when higher accuracy in measurement is required and this cannot be done using a metre rule. Vernier callipers… Read More »MEASUREMENT II
Post Views: 9 Introduction Work done per unit charge is called electrical potential. Current is the flow of charge. For current to be continuous, potential difference between the two points… Read More »CELLS AND SIMPLE CIRCUITS
Post Views: 1 Some substances get charged when rubbed against other substances i.e. nylon, plastic, paper etc. the charge acquired stays within the body i.e. it does not move and… Read More »ELECROSTATICS I