Electricity

Relation between Internal resistance and Electromotive force of a cell Each energy source, viz, cell or generator, has internal resistance. The amount of resistance which…

Electromotive force of the cell Due to the presence of positive and negative charges in the two terminals of the cell, a potential difference appears…

The internal resistance of a cell For the operation of our daily household appliances, for example, radio, television, refrigerator, cassette player, torchlight etc. we need…

Volt Definition: The amount of work done expressed in joule in bringing 1 coulomb of charge, starting from any point of an electric circuit and…

Experiment: to determine the mechanical equivalent of heat, J There are two electrical methods for the determination of mechanical equivalent of heat, viz – (i)…

Electromotive force is a difference in potential that tends to give rise to an electric current. Energy is converted from one form to another in…

Joule’s laws for the Generation of Heat In 1841, the famous English scientist J. P. Joule from the experimental results stated three laws relating to…

Effect of Temperature on resistance If you look at the coil of a heater you will see that as soon as current flows through the…

George Simon Ohm established the relationship between potential difference and current, which is known as Ohm’s law. The current flowing through a conductor is, I…

The current density at a point is defined as the quantity of charge passing per unit time through unit area, taken perpendicular to the direction…