- A dynamo is a type of electrical generator. - It operates based on Faraday's law of electromagnetic induction. - In a cycle dynamo, the rotation of the bicycle wheel provides the mechanical energy to spin a rotor (either magnets or coils) within the dynamo. - This rotation causes a change in magnetic flux through coils, inducing an electric current. - This generated electrical energy is then used to power the bicycle lights. - Therefore, the conversion is from the mechanical energy of rotation to electrical energy.