Producing electricity from potatoes

A primary voltaic cell makes use of a dilute solution of sulphuric acid in which one plate each of copper and zinc is dipped. The electricity in this cell is produced dues to the migration of electrons from the zinc plate to copper plate in the dilute sulphuric acid solution. In fact, dilute sulphuric acid provides the path for the movement of electrons. In a similar way, potatoes act like the solution of dilute sulphuric acid between the copper and zinc strips which are used for producing electricity from potatoes.
Requirements:
1. 8 medium sized potatoes
2. 8 strips of copper 5 cm x 1 cm
3. 8 strips of zinc 5 cm x 1 cm
4. Copper wire
5. One 5 volt bulb with holder

You need to follow the following methods:
1. Take 8 medium sized potatoes and insert a strip of zinc on one end of each potato. Similarly, insert one copper strip on another each end of each potato as shown in the figure below.
2. Arrange these potatoes o a table in two rows, each containing four potatoes. Connect the zinc strip of one potato to the copper strip of the other with the copper wire as shown in the figure below. Connect all zinc and copper strips with the help of the copper wire.

3. Now, take one wire connected to the zinc strip and connect these two with the 4.5 volt bulb. You will see the bulb immediately glows because the whole assembly acts as a battery. The bulb will glow only for limited time. You can also use lemons or orange instead of potatoes.