Learn Electronics

The quantities whose values vary continuously or remain,constant are know as analogue quantities.For example,the temperature of air varies continuous fashion during 24 hours of a day.If we plot a graph between time and temperature recorded at different...

Conductors:- Why do we always use metal wires for conduction of electricity? Because,they are good conductors of electricity and offer less resistance to the flow of current.But how can they conduct electricity with much easy? Metals like silver...

A fuse is a safety device that is connected in series with the live wire in the circuit to protect the equipment when excess current flows.It is short and thin piece of metal wire that melts when large current passes through it.If a large,unsafe...

While electricity becomes part and parcel of our lives,care should be taken to save ourselves from its hazardous effect.Voltage of 50 V and current of 50 mA can be fatal.Major danger of electricity are electric shock and fire.Here we discuss some...

An electron gun is used to investigate the properties of electron beam.The electrons are produced by the thermionic emission from a tungsten filament heated by 6V supply.A high positive potential is applied to cylindrical anode (+).The electrons are...

In the 1850's physicists started to examine the passage of electricity through a vacuum by putting two electrodes in a sealed vacuum tube.Some kind of rays were emitted from the cathode or the negative electrode.These rays were called cathode rays.J.J...

For this purpose we use different electrical instruments to detect the current in the circuit.Galvanometer and ammeter are some common examples of current measuring instruments. Galvanometer is very sensitive instrument and can detect small current in...

Before the idea of free electrons which constitute current in metal,it was through that current in conductors flow due to the motion of positive charges.Therefore this convention is still in use.We can understand the concept of the conventional current...

Most of the electric current around us us bound in neutral atoms.It is not easy to overcome the electrostatic force of attraction between the nuclei and electrons in at atom.How,ever in metals some electrons are not tightly bond to the nuclei and...