What is electromagnetic induction?

Electromagnetic induction is defined as the generation of a voltage induced by a changing magnetic field. This phenomenon is a fundamental principle in electromagnetism and is crucial for the operation of various electrical devices, such as generators and transformers.

When a conductor, like a wire, is exposed to a varying magnetic field, electrons in the conductor experience a force that can lead to the generation of an electric current. This principle was first discovered by Michael Faraday in the 19th century, and it underpins the functionality of many modern technologies, including electric power generation and transmission.

The other options, while related to electricity in some way, do not accurately describe electromagnetic induction. For instance, generating electricity from magnets may imply some static magnets are used without noting the essential influence of a changing magnetic field. The conversion of light to electricity typically refers to photovoltaic effects, not electromagnetic induction. Lastly, the emission of electrical energy as heat pertains more to resistive heating than to the process of electromagnetic induction itself.