A scientist who studies electricity and circuits is most commonly called an electrical engineer.

Here's why:

* Electrical engineering is a specific branch of engineering that focuses on the design, construction, and application of electrical systems.

* While other scientists might study aspects of electricity (like physicists or chemists), their focus is broader.

However, there are other related terms you might encounter:

* Electrophysicist: This term is less common but refers to a physicist who specializes in the study of electricity and its properties.

* Circuit designer: This term is more specific, referring to someone who designs and builds electronic circuits.

Ultimately, the best term depends on the specific area of study and the level of specialization.