How To Make Generator using DC Motor for School Science Exhibition


In this dc motor project ideas topic, we are going to show you how to build a simple generator using a DC motor model at home for your science project or exhibitions.

This science working model is a homemade project is done using materials like 2 DC motors, wires and bottle cap which is easily available at home at low cost.

Introduction to small DC motor generator

A device which is used to convert mechanical energy into electric energy is called an electric generator.

In 1831, a scientist named Michael Faraday discovered principle of electromagnetic induction, based on which generator’s work.

Working Principle of DC Motor

Faraday discovered that when an electric conductor like a copper wire is moved through a magnetic field, electric current will flow in the conductor.

Here the mechanical energy of the moving wire is transformed into the electric energy of current that flows in the wire.

What is the difference between DC Motor and DC Generator

The Main difference between DC Motor and DC Generator is as below

DC motor converts electrical energy into Mechanical Energy power output DC generator converts mechanical energy into direct electric energy.

Types of DC generators

Classification of DC motor is based on the way in which a magnetic field is developed in the stator of the machine. There are three basic classifications of DC generators namely:

  • Permanent magnet field
  • Separately excited field
  • Self-excited field

How to make a Generator with DC motor step by step?

In this video, we will show steps by step video instructions on how to build the DC generator model at home easy way.

First take one DC motor and a pair of connecting wire.

On one end of the wire, insert the red wire into one of the holes of first DC motor and the black wire into another hole of first DC motor.

Next, on another end of the wire, insert the red wire into one of the holes of second DC motor and the black wire into another hole of second DC motor.

Take a water bottle cap and create a hole at the center of the cap.

Take an old refill of pen and cut it into small piece and insert it into the center of the cap hole to form a shaft.

Next connect one end of the shaft with central cap to first DC motors and another end of the shaft to the second DC motor.

You will observe that the cap will start to spin when both DC motors are connected.

Materials Used to Make DC Generator

Materials used in this video are shown below to build a DC generator model at home by taking the help of your parents.

  • 2 DC motors
  • 2 – 2 piece connecting wires
  • Pierced bottle cap
  • Scissor
  • Refill of ball pen

Questions & Answers on DC Generator using Motor

1. What is the working principle of DC generator?

Field coil produces an electromagnetic field and armature conductors are rotated into the field, thus resulting in generation of electromagnetic force.

2. What is the difference between DC motor and DC generator?

DC motor transforms electrical energy into mechanical energy; on the other hand DC generator transforms mechanical energy into an electrical energy.

3. Can a DC motor be a generator?

Yes, DC motor also works as generator. It is a ready-made generator which will generate electricity.


This is a simple dc motor project, where we will use the DC motors to build the DC generator working model helps science students to learn about how a dc motor work and principle involved in it.

as well how to make it with easily available materials at home.

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