Today's most mainstream bumper cars also retain the style of 100 years ago, called the DC-fed bumper cars with upper and lower electrode plates. The 90V direct current is generally connected between the ceiling and the floor. When driving, the motorized pantograph above the bumper will be virtually connected to the ceiling due to vibration, and the air in the middle is ionized, creating a visual effect of sparks and lightning. However, this type of bumper car requires a steel beam skeleton and a ceiling electrode, and the construction is very troublesome. Therefore, floor-fed bumper cars are preferred in indoor places such as shopping malls. Simply lay the positive and negative plates evenly on the floor, separated by an insulating strip in the middle, and install four contact pins at different positions on the bottom of the bumper car to ensure that they are in contact with the positive and negative plates on the ground at any time to form a path drive motor. There is a main switch for the upper and lower feeding and floor-fed bumper cars, and the workers are unified to control the power on and off. Of course, today there are battery-type bumper cars that do not require an external power supply.