The difference between zero-ohm resistance and direct wire connection

What is a zero ohm resistor? 

A Zero-ohm resistor is a wire link used to connect traces on a printed circuit board and is packaged in the same physical package format as a resistor. This design format allows it to be placed on the circuit board using same automated equipment used to place other resistors, instead of using other a separate machine to install a jumper or other wire. The resistance is approximately zero (typically its 10-50 mΩ maximum is specified). A percentage tolerance would make sense as it would be specified be specified as percentage of ideal value of zero-ohm, so it is not specified.

What is a direct-wire-connection? 

A Direct-wire-connection describes the use of a wire to aid in flow of currents of any ratings as per the size of the conducting wire. Therefore, we will not connect directly using wire instead of a zero-ohm resistor because initially one uses zero-ohm resistor to allow traces on same side of PCB to cross to another trace, one trace has a zero-ohm resistor while the second trace runs in between the leads of the resistor, hence avoiding contact with first trace.

Figure 1 Zero-Ohm Axial-Lead Resistor

Figure 1 Zero-Ohm Axial-Lead Resistor

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