The power supply of bumper cars is also known as ground grid power supply: a power supply network composed of strip conductors, which is arranged on a large enough insulation board with a number of conductive strips. The electric polarity of adjacent conductive strips is opposite, and each conductive strip is connected with the same name end of the power supply in an appropriate way.When an object is moving freely in the power supply network, a sliding contact group can be used to draw electricity or electrical signals from the power supply network.The block power supply network can be directly applied to power bumper cars in the amusement park.Using this power supply method of bumper car activity site, the ground no longer need to lay steel plate, can directly use the ordinary ground.The rules of the bumper car game are: the driver tries to complete the fastest circle in the field, on the way to the rampage, knock off the opponent's car.When the time is up, the operator turns off the power when the game is over.Bumper cars are usually so slow that even a collision does not damage the person or the car.The first bumper cars appeared in the 1910s.