In a simple electric cell, dilute sulphuric acid is taken in a glass trough and one plate of zinc (Zn) and another plate of copper (Cu) are dipped in it. The plates are separated by some distance. The Cu plate acts as the positive pole while the Zn plate acts as the negative pole.
Using connecting wires of copper, a circuit consisting of the cell, an electric bulb and a key is formed. When the key is closed , the circuit is completed and an electric current flows through it from the positive sold to the negative sold through the connecting wires. The current is produced by the chemical reactions in the cell.
The bulb glows due to the current.
This cell is called Voltas cell.
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