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8 Difference between Electric Motor and Generator [Including Block Diagram]

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In electrical engineering, the foremost topic is Electrical Machine. The electrical machines consist of the two major parts one is the electrical motor and another is the generator.

Both are Electromagnetic Devices and works in the Alternating current (AC) and Direct current (DC) system. But they have some different functions, working principles, working rules, uses, etc.

I am sharing this tutorial by using the comparisons of the electric motor and generator.

Difference between Electric Motor and Generator [Table Comparison]

Sr.No. Content Electric Motor Generator
01 Definition The device which converts electrical energy into mechanical energy is called as the Electric Motor. The device which converts mechanical energy into electrical energy then this device is called as Generator.
02 Signify It is signified by EM or M. It is signified by the G.
03 Fleming’s Rule
(base on working)
It works on the basis of Fleming’s Left-Hand Rule. It works on the basis of Fleming’s Right-Hand Rule.


(base on working)

The principle of  DC motor is –
When a current-carrying conductor is placed in the magnetic, it experiences a mechanical force.
Whereas, the principle of the generator is based on Electromagnetic Induction.
05 Function
(Input and Output)
In the electric motor, electrical energy is in the input form. In the Generator, electrical energy is in the output form.
06 Current Role According to the above diagram, the current is supplied to the armature windings. According to the above diagram, the current is produced in the armature windings.

07. Block Diagram

You can easily understand the working of the electric motor and generator through the following block diagram.

  • Block Diagram of Electric Motor:

Block diagram of Electric motor

  • Block Diagram of Generator:

Block diagram of Electric Generator

08. Working Rules for Electric Motor Aand Generator:

The electrical motor and generator are working on the basics of the fleming rules – fleming’s left-hand rule and fleming’s right-hand rule.

  • Electric Motor:

In the electrical motor, force, magnetic field and current are working as per the fleming left-hand rule. You can easily understand from following the figure.

Fleming Left hand rule

You can remember the fleming left-hand rule by using a short trick (father-mother-children).

  • Generator:

Generator work on the fleming right-hand rule. I have mentioned the relationship between the current, force or motion and magnetic field in the below figure.

Fleming Right hand rules

You can remember the fleming right-hand rule by using a short trick (My mother is cute).

In the above table, we have seen fleming’s left and right-hand rules are used. Check out the list of different rules and laws in electrical engineering.

These are all the main 8 points for the difference between Electric Motor and Generator. Many of the students get confused between these two electrical devices. I tried my best to make it simple as it is.

Related Read:

If you have any queries about this tutorial or you have any points to mention, please comment below.

I will be coming soon with the upcoming tutorials. See you soon…

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