All About Electrical & Electronics
Ohm’s Law:- Consider a circuit as shown in Fig. 1 which consists of an ammeter, eureka wire 4 meters length, a rheostat and a battery, all connected in series. A voltmeter has been connected across the two ends of eureka wire. For various settings of the rheostat tabulate the readings of V and I with … Read more
Effects of Electric Current:- There are three main phenomena that an electric current can produce. They are: (1) Heating effect – When an electric potential is applied to a wire the drift of electrons is opposed by the resistance of the wire, so heat is produced. The production of electrical heat can well be compared … Read more
Conductance:- The reciprocal of the resistance is called as the conductance and is represented by G. As the resistance is defined as the opposition offered by the conductor to the flow of current, so the conductance is defined as the inducement which the conductor offers to the flow of current. The unit of conductance is … Read more
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
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