kelvin connection is 4 wire circuit.
there are 2-current carrying lines and
2-voltage sensing lines.
the current carrying lines (or terminals) are used for
connecting the load . this line is a heavy or thick line .
the voltage sensing pair lines or terminals are
usually connected to the load .
at first it looks all pairs are identical(since both are connected to the same load) . but the voltage sensing lines will carry
the voltage levels only and it should not be used for load current carrying.
the voltage sense line connectd to the regulators appropriate points , sense the (load) voltage and regulates.
the idea is ,the drops in the current carrying lines are taken into account
and the regulator will fix the voltage required at the 'load'
hope you got the point.
srizbf
31stmay2010