I was reading this article on how the breaking mechanism of a Sawstop works. For those who might not know, Sawstop is a table saw fitted with at least a conductivity sensor that detects changes in current passing through the blade as it comes into contact with something other than wood (the table saw operator's fingers, for instance).
This got me thinking about how electricity flows through a circular plate. If we connect wires to the plate (see attached diagram) and assuming the wires form a conductive closed loop, would the current change if we changed where the 2 wires were connected to that plate? I'm guessing no since Kirchoff's junction rule states that same current drawn through one wire must leave through the other wire. We can just treat the plate as a resistor.
If a person touches the plate and assuming he doesn't form another closed-loop path, would he change the current flowing through the wire? I'm guessing no since he'd just be a floating conductor/resistor, in principle.