Brief description

An electric generator is a device that transforms mechanical energy into electrical energy, allowing the supply of current for various applications.

Use / Function

• Energy: Electricity supply for lighting.
• Industry: Powering electric motors and machinery.
• Emergency: Backup systems in case of grid failure.

Operating principle

It is based on Faraday’s Law of electromagnetic induction. By moving a conductor (copper coil) within a magnetic field (magnets), an electromotive force is induced that generates a flow of electrons or electric current.

How to create it

1. Build a coil by winding insulated copper wire many times around an axis.
2. Place powerful magnets around the coil.
3. Connect a shaft to a power source (crank, water wheel, turbine) to rotate the coil or the magnets.

Materials needed

• Conductor: Copper wire (essential for its low resistance).
• Magnetic field: Permanent magnets or electromagnets (iron core with copper).
• Structure: Iron for the core and wood or metal for the frame.

Variants and improvements

• Dynamo: Generates direct current (DC).
• Alternator: Generates alternating current (AC), more efficient for transport.
• Turbines: Large-scale generators driven by steam, water, or wind.

Limits and risks

• Shocks: Risk of electrocution if there is no insulation.
• Heat: The Joule effect generates heat that can melt insulation if overloaded.
• Dependence: Requires a constant source of mechanical energy.