By moving the slider for the voltage investigate how the current flowing through each lamp increases and how this increase in current increases the brightness of the lamps.
Now alter the resistance slider of one of the lamps and see how decreasing the resistance increases the current (as per Ohms Law). The current flowing in the other parallel branch and the brightness of that lamp are unaffected by the resistance change.
Also note how the voltage across the lamps is unaffected by the change in resistance and stays the same as the battery voltage.
Make a note of how the sum of the currents flowing through the lamps matches the current flowing out of the battery.
Note how Ammeters and Voltmeters are connected into the circuit differently.
