Abstract: An electrically operated water device includes: a sports carrier; a propeller connected to the sports carrier to generate mechanical power for driving the sports carrier to move in a direction; a battery unit arranged in the sports carrier for releasing electrical power stored therein; an electronic speed control arranged in the sports carrier and electrically connected to the battery unit and the propeller to supply electrical power from the battery unit to the propeller and to control an amount of the mechanical power generated by the propeller; and a first heat dissipation device coupled to the electronic speed control and having a plurality of first fins arranged parallel to each other to have every two adjacent ones of the first fins define therebetween a first heat dissipation trough in communication with a bottom the sports carrier and extending in a direction corresponding to the moving direction of the sports carrier.