The words 'electric' and 'electrical' are both adjectives related to electricity, but they are used in slightly different ways.
'Electric' is used to describe specific machines or devices that operate using electricity. For example, you might say "electric motor" or "electric toothbrush". It's used when the object has been specified and runs on electricity.
an electrical light
an electrical guitar
an electrical drill
On the other hand, 'electrical' is used in a more general way to talk about things that use or produce electricity, such as "electrical equipment" or "electrical appliances". It's also used to describe people or organizations connected with the production of electricity or electrical goods, like "electrical engineer". It refers to something related to electricity, but not necessarily running on electricity.
an electrical fault
电路故障an electrical equipment
an electrical wiring
电线an electrical signal
an electrical engineer
电气工程师
In a nutshell, electric is usually used to describe something that uses or produces electricity, You use electrical with more general nouns such as equipment and wiring and things that are concerned with electricity.
However, the distinction is not always so clear now.
an electric/electrical company
电力公司an electric/electrical current
电流an electric/electrical shock
触电
