The Principles and Uses of Electrophorus and Microphone
A device which provides an almost unlimited supply of charge, by induction, was invented by Volta about 1800; it is called an electrophorus. It consists…
Physics
Significance of the Hall Effect On SemiConductors
In 1879, Hall found that an e.m.f. is set up transversely or across a current-carrying conductor when a perpendicular magnetic field is applied. This is…
Application, Working Principles and Uses of Potentiometer
Pointer instruments are useless for very accurate measurements: the best of them have an intrinsic error of about 1 percent of full scale. Where greater…
Laboratory and Industrial Uses of Multimeter and Voltmeter
A multimeter instrument is one which is adapted for measuring both current and voltage. It has a shunt R as shown, and a series of…
How to Convert Milliammeter Into Voltmeter and Ammeter
Ohm’s law enables us to use a milliammeter as a voltmeter. Let us suppose that we have a moving – coil instrument which requires 5…
Definition of Graham’s Law and Explanations of Thermal Agitations
What are Thermal Agitations? When a gas passes through a porous plug, a cotton-wool wad, for example, it is said to diffuse’. In that it…
Application and Uses of Bunsen’s Ice Calorimeter
The Bunsen’s ice calorimeter is a device for measuring a quality of heat by using it to melt ice. When ice turns to water, it…
Calorimetry and the Application of Newton’s Law of Cooling
Newton’s Law of Cooling: Newton was the first person to investigate the heat lost by a body in air. He found that the rate of…
Applications of Ostwald Viscometer and Stoke’s Law of Terminal Velocity
An Ostwald Viscometer, which contains a vertical capillary tube T, is widely use for comparing the viscosities of two liquids. The liquid is introduced at…
Turbulent Motion and Explanations by Poiseuille’s Formula
Poiseuille’s Formula holds as long as the velocity of each layer of the liquid is parallel to the axis of the pipe and the flow…