Electric Current and its Effects
Electric current is the flow of charge through an electric circuit. An electric circuit is made up of various components known as electrical components. It is convenient to represent electrical components by symbols. The representation of an electric circuit with the help of symbols is called circuit diagram. The current in a circuit is made to flow by using an electric cell. Electric cell is a device used to convert its stored chemical energy into electrical energy. The combination of two or more cells is called a battery.
An electric current flowing through a conductor produces various effects. When an electric current flows through a conductor, the conductor gets heated. This is called heating effect of current and has many applications. Materials having low melting point are used to makes wires used in a safety device called fuse which prevents fire and damage to electric appliances.
When a magnetic compass is placed near a current carrying wire, the needle of the compass is deflected resulting in the conclusion that when an electric current flows through a conductor, the conductor behaves like a magnet. This is called magnetic effect of current.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electric bell is an important application of Electromagnet.