Superposition of current.
Several resistors are connected in a "T" arrangement. both batteries are plugged in and the current at "A" is measured. One of the batteries is then removed and replaced by a short circuit bar. The current is again measured at "A" . The first battery is returned to the circuit and the second battery is replaced by a shorting bar. The current at "A" is again P. The sum of the two partial currents is equal to the original total current.
|two batteres and an ammeter.||6J|
Unfortunately, there are no media for this demo. :(