ELECTRIC MEASUREMENT
RESISTIVITY AND CONDUCTIVITY The resistance of a wire maintain at a constant temperature is related to its length L and its cross-sectional area (A) by the expression R = ρl… Read More »ELECTRIC MEASUREMENT
Physics
ELECTROLYSIS
DEFINITION OF SIMPLE TERMS Electrolysis – Is the process whereby a liquid conducts electricity by the movement of positive and negative ions within the liquid while undergoing chemical changes. Electrolytes… Read More »ELECTROLYSIS
ELECTRIC CELLS
ELECTRIC CIRCUIT Electric current is simply electric charge in motion. Electric cells are chemical devices, which are capable of causing an electric current to flow. This produces electric force, which… Read More »ELECTRIC CELLS
ELECTRIC FIELD
An electric field is a region of space which surrounds a system of electric charges. Electrical forces will act on any electric charge which is placed within the region. Electric… Read More »ELECTRIC FIELD
GRAVITATIONAL FIELD
INTRODUCTION Gravitational field is a region or space around a mass in which the gravitational force of the mass can be felt. Gravitation is the force of attraction exerted by… Read More »GRAVITATIONAL FIELD
ELECTROMAGNETIC WAVES
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 as a combination… Read More »ELECTROMAGNETIC WAVES
Sound Energy
Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is… Read More »Sound Energy
CAREERS IN PHYSICS
Physics has several applications on health, technology & engineering, agriculture and applied sciences. As a results, below are some of the aspects/careers related to physics. IN HEALTH We have: Human… Read More »CAREERS IN PHYSICS
ELECTRONICS
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, rubber, plastics etc.… Read More »ELECTRONICS
RADIOACTIVITY
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= 88). Radioactivity or… Read More »RADIOACTIVITY
PHOTOELECTRIC EFFECT
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 electromagnetic radiation falls… Read More »PHOTOELECTRIC EFFECT
ELECTROMAGNETIC INDUCTION
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 current is called… Read More »ELECTROMAGNETIC INDUCTION
ELECTROMAGNETIC SPECTRUM
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 waves and gamma… Read More »ELECTROMAGNETIC SPECTRUM
UNIFORM CIRCULAR MOTION
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 is constant. This… Read More »UNIFORM CIRCULAR MOTION
FLOATING AND SINKING
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 known as buoyant… Read More »FLOATING AND SINKING
THE GAS LAWS
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 constant”. The comparison… Read More »THE GAS LAWS
QUANTITY OF HEAT
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 defined as the… Read More »QUANTITY OF HEAT
HEATING EFFECT OF AN ELECTRIC CURRENT
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 work done as… Read More »HEATING EFFECT OF AN ELECTRIC CURRENT
ELECTROSTATICS
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 by lines of… Read More »ELECTROSTATICS
CURRENT ELECTRICITY
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 point to another.… Read More »CURRENT ELECTRICITY