Internal Resistance

This is a teacher or user controlled, realistic 3d simulation of an experiment that allows you to measure the internal resistance of a single dry cell.   The idea of a battery having a resistance can seem counter intuitive.  Surely the battery is the opposite of a resistor it is creating a current, not preventing one?  However, this is not correct.  The chemical processes in a battery creates the movement of electrons, but these still have to overcome whatever the resistance, no matter how small, of the battery itself.  If it helps think of the battery as something that incorporates a resistor, then you can treat this resistor exactly as you would any other resistor in the circuit.

The user needs to complete the circuit by clicking on pairs of connectors to connect them.  The user has control of the position of the rheostat slider and the power to the circuit.  The user is free to move anywhere within the laboratory in order to interact with the apparatus.