If you had a DC voltage source that supplied a voltage V volts and you connected a resistor of R1 ohms to the + and - terminals of this source then shorted the resistor with a wire of little but measurable resistance - R2 ohms would the following happen: *would the wire draw high current from the voltage source. ie current drawn = V / R2 and if this didn't cause the wire to burn would this current be limited by the ability of the circuitry controlling the voltage source and hence if it couldn't reach the current needed to meet the resistance of the wire ( R = V / I ) would it increase the resistance of this wire? So could we have a voltage controlled variable resistor? *is the above physically possible? And if so how does this work? Cheers!