Jumper resistor is also known as 0Ω resistor. ① In circuit design, the power supply can be separated as multiple channels with 0Ω resistor for commissioning or compatible design. ② It can be used as jumper. If certain section of the line is not used, just simply attached a 0Ω resistor (appearance will not be affected). ③ When the parameter of the matching circuit is uncertain, it can be replaced by 0Ω first and replace it with component with specific value during commissioning. ④ When wiring is impossible, you can also add a 0Ω resistor. ⑤ Under high-frequency signal, it can act as inductor or capacitor (related to the characteristics of external circuit) for dealing with EMC problems. ⑥ Used for cross-over connection of current circuit to provide shorter returning path and reduce interference. ⑦ Sometimes, user will change settings during circuit configuration. In order to reduce maintenance cost, 0Ω resistor can be used as alternative of jumper and welded on board. The actual resistance of a 0Ω resistor is not zero, the definition of which is ≦50mΩ (or ≦20mΩ). Therefore, parts with ±1% or ±5% share the same specifications. For functional perspective, jumper resistance dose not require precision. What user needed is the maximum rated current (i.e. current allowed to pass) instead of cannot be purchased or produced.