A cover comprises a first guide portion and a second guide portion. A side surface of the cover pivots to a case. When the cover closes, the cover mantles a moving component in a container of the case. The first guide portion is adjacent to a first side surface. When the cover opens, the first guide portion pushes the moving component to depart from a specific position in the container. The second guide portion is adjacent to a second side surface of the cover. When the cover closes, the second guide portion pushes the moving component to the specific position in the container. Moreover, in an electrical apparatus, a moving component is placed in a container thereof. The electrical apparatus includes a cover and a case in which the container is disposed. The cover has a side surface pivoting to the case. When the cover closes, the cover mantles the moving component in the container.