Something is defined as 'electrical' or 'electric' if it uses electricity to function, is involved with the production or transmission of electricity, or is in some other way related to electricity.

electrician. noun. elec·​tri·​cian i-ˌlek-ˈtrish-ən. : a person who installs, operates, or repairs electrical equipment.

Let us start with the word "electric," which comes from the noun electricity. "Electric" is an adjective; that is, a word used to describe a noun. Its simple meaning is "operated by electricity." Here are two examples. There is an electric fence around the cows in that field.

The boat runs on an electric motor. My dentist recommends I get an electric toothbrush. You use electrical when you are talking in a more general way about machines, devices, or systems that use or produce electricity. Electrical is typically used in front of nouns such as equipment, appliance, and component.