Prabin Kalikote

An electromagnet is made by using a cylindrical formof an insulated copper coil havinga large number ofclose turn is a solenoid.

It is used to strengthen the magnetic field. Thedevice that breaks the circuit is MCB.

fig. Electric bell

When a current is passed through a wire, itproduces a magnetic field around it which is called themagnetic effect of an electric current.

When the current is passed through the wire ofhigh resistance, it becomes extremely hot andproduces heat which is called the heating effect ofan electric current.

When the current is passed through a wire of highresistance which becomes extremely hot and produceslight which is called the lighting effects of an electriccurrent.

The device which converts mechanicalenergy into electrical energy is called a dynamo.

The process of producing current in a closed coil dueto the relative motion between magnet and coil iscalled electromagnetic induction.