## Wednesday, 16 November 2016

### electric motor

how to make an electric motor at home easily

INTRODUCTION:

Electric current is nothing but net amount of charge flowing through unit area of cross section of a conductor per unit time.  As we know that electrons possess negative charge that is electrons are negatively charged particles.  When these electrons are flowing through any electrical conductor, there is a development of magnetic field surrounding to the conductor. When this conductor is placed in any external magnetic field, then there is action of magnetic force on the conductor.  This force causes the moment of the conductor in the magnetic field.  This principle is applied in an electric motor.  In this motor, instead of a single long conductor, we use to take a rectangular coil, which is usually placed in a strong magnetic field.  This coil is rotated in the magnetic field, due to the flow of current.  Which is usually rotated in magnetic field, this rotation of coil is utilized as mechanical energy.  This mechanical energy is utilized for various purposes at home.

This concept reveals electromagnetic induction.  As discussed, when electric current passes through the coil, magnetic field is developed, and the coil also acts like a magnet. The two faces of the coil acts like magnetic poles, on one side it acts like a north pole and another side it acts like a south pole.  Hence, the current passing coil acts like a magnet.

Materials required:
1)      A  Wooden platform
2)      9v battery
3)      Metallic strips
4)      Non insulated copper wire
5)      Key to on/off the circuit

Procedure:

The  circuit diagram consists of the construction part of electric motor.  Take a 9v battery, connect to the metallic strips which is connected to a circular coil and the two ends of the circular coil are connected to the metallic strips.  Above the battery, a strong magnet should be placed.

Working: When the circuit is closed, the current starts flowing through the metallic strips.  The coil acts like a strong magnet consisting two poles, and this is repelled by the external magnet, with which the net force acts on the coil, by which the coil gets rotated, the continuous rotation of coil is utilized in our daily life as electric water motor, water pump, mixture, etc.

USES:

Electric motor is a device which converts electrical energy into mechanical energy, this principle is applied in our daily life at different situations.