Just silly question, but not clear for me. For example, I have some device with 20A DC consumption. I have to connect this device to power source by some multicontact connector, 20 pins for example. Each pin can carry 2A of DC current.
How much VCC and GND contacts I should use to handle 20A to the device?
Variant 1: 10 VCC pins and 10 GND pins, because connector should pass 20A through VCC pins to the device and then return the same 20A to the power source by GND contacts
Variant 2: 5 VCC pins and 5 GND pins, because each pin can handle 2A, so 2A*(5vcc + 5gnd) = 20A