Jumpers have more than 0 Ω
Jumpers have a very low resistance value because they shorts patterns, which gives it an another name, "zero ohm resistor".
Even though they are called "zero ohm resistor", the Flat Chip Jumper Resistor RK73Z, which has a shape of a chip resistor, has a resistance value of 50 mΩ or less due to its structure.
For this reason, the allowable current is comparatively small and it cannot be exceeded. Also, an attention needs to be paid to the heat generation and deterioration caused by the electric current.
On the other hand, the metal plate chip jumpers SLZ1 and TLRZ have low electrical resistance and thermal resistance, making them suitable for the use in large current.