Chapter Summary
Flow of electric charge is called electric current, and its SI unit is Ampere.
The path through which electric current flows is called electric circuit.
The difference in the amount of electric potential energy between two points in an electric circuit is called potential difference.
Potential difference between two points is directly proportional to the electric current.
V ∝ I
The hindrance offered by a conductor to flow of electric current is called resistance.
Resistance in a conductor depends on
Resistors are joined from end to end, as if making a queue.
In this case, total resistance of the combination is equal to sum of resistances of all resistors.
Resistors are joined in a way that one end of all resistors is joined to positive terminal, and another end of all resistors is joined to negative terminal.
In this case, reciprocal of total resistance is equal to sum of reciprocals of resistances of all resistors.
The heating of conductor because of dissipation of electrical energy is known as Heating Effect of Electric Current.
The rate, per unit time, at which electrical energy is transferred by an electric circuit, is called electric power.
The SI unit of power is the watt which is equal to one joule per second.