Jumper-cable connections involve the use of anodes, which are metal plates or rods that are connected to a battery or other power source. Anodes are used to provide a path for electrical current to flow from the power source to the device being powered. The anode is connected to the positive terminal of the power source, while the cathode is connected to the negative terminal. The connection between the anode and the cathode is made with jumper cables, which are insulated wires that are connected to the anode and cathode. This connection allows the electrical current to flow from the power source to the device being powered.