All About Electrical & Electronics
Resistance. The resistance of a conductor is that property which opposes the drift of electrons in it. Also under constant conditions the ratio of potential difference to current in the circuit remains constant and this constant is called the resistance of the circuit.Thus, numerically, Where V is the potential difference in volts and I is … Read more
The M.K.S. System of Units An absolute system of units is one in which the units of a few fundamental quantities are selected, and those of all other quantities derived units are expressed in terms of the fundamental units in accordance with the equations expressing the physical relation existing between them. All quantities used in … Read more
Potential – The potential of a body may be defined as the work done in joules to bring a unit electric charge from infinity to the body. It will be observed that the word infinity has been used in its definition and it is difficult to find an infinite point. Thus it is practically impossible … Read more
Certain metals like silver, copper, Aluminum lose their electrons in the outermost shell very easily, and such electrons are called free electrons. Due to the loss of negatively charged electrons the neutral atom is left with an excessive positive charge and is called as positive ion represented by circle with a + sign in it. … Read more
It has been observed that when a copper rod is rubbed with silk is not electrified and the rod is electrified only when it is held in an ebonite handle. Also the glass rod with Silk is electrified only in the portion which is rubbed in the very beginning. As the copper rod allows electricity … Read more
There are several which have been advanced to prove the phenomena of electrification. (1) Benjamin Franklin’s One-Fluid Theory. In 1749 Bar Franklin suggested that the electrification of bodies is due invisible fluid beyond human concepts which combines with them in different degrees. When the body is neutral it has a certain quantity of fluid. The … Read more
Near about 2600 years ago (600 B.C.E.) it was noticed by Greeks tat amber (a yellowish-brown resin which hardens to a stone like material) when rubbed with silk possessed the property of attracting small pieces of cork, paper etc. In Greek the ember is named as electron. Then again in 1600 C.E. Dr. Gilbert showed … Read more