Current Electricity

This topic explains electric current and current density. Positive and negative charges and units of electric current are also described here.

This topic explains the concept of electric current in conductors. It discusses the positively and negatively charged nuclei. It discusses the case when no electric current is present.

In this topic, we will learn about Ohm’s law in detail. It explains how resistance depends on the dimensions of the conductor with formulas and derivation. It also discusses the resistivity, conductivity and current density.

This topic deals with the concept of the drift of electrons and drift velocity with examples. It explains the origin of resistivity and how electric conductance reproduces Ohm’s law. We will get to learn about mobility with its SI unit and formula.

This topic discusses the limitations of Ohm's law listed with their explanation. Some graphs are also explained for better understanding.

This topic deals with the resistivity of various materials with examples given in the tabular form. It discusses the commercially produced wire bound and carbon resistors. It also elaborates on the colour-coded resistors with figures.

This topic explains the colour code for resistors through a table in which colour, number, multiplier and tolerance are listed. The properties of carbon resistors are also highlighted here.

This topic discusses how the resistivity of different materials depends on the temperature in detail. It gives the graphical explanation for resistivity of copper, nichrome and semiconductor.

This topic explains the electric energy and electric power. It explains this concept through a simple circuit and Ohm's law.

In this topic, we will learn about the concepts related to current electricity. It discusses the series and parallel combinations of resistors with examples and figures.

This topic deals with the electrolytic cell and electromotive force with an example. It also explains the concept of internal resistance and the charges in the clouds.

This topic discusses the combination of cells in series and parallel in an electric circuit. It explains the rules of combination and talks about the German physicist Gustav Robert Kirchhoff.

In this topic, we will learn about the concept of current electricity. It discusses the Kirchhoff’ rules and their statements proved in detail with example.

This topic explains the Wheatstone bridge as an application of Kirchhoff’s rules with an example. It also discusses the balance condition for the galvanometer with figures.

In this topic, we will learn the meter bridge and how to connect it with various units. It also explains the roles of resistance and galvanometer in the circuit with examples.

In this topic, we are going to learn about the potentiometer, its structure and its advantages. It also discusses the use of measuring internal resistance with examples.