electrochemical cell???

electrochemical cell = 電池?
Electrochemical cell is a type of cell, but NOT all cells are electrochemical cells.
There are two types of cells: namely electrochemical cells and photocells.


點解書個definition咁複雜?
In science, definition of a term must be precise and unite. Therefore, definition may sometimes be complicated.


what is the definition of electrochemical cell?
An electrochemical cell is a device capable of deriving electrical energy (or driving an electron flow or a current) from chemical reactions.
For example, a zinc-carbon cell can derive electrical energy (can drive electron flow or current) from the chemical reactions at the two electrodes:
Zn(s) → Zn²⁺(aq) + 2e⁻
2NH4⁺(aq) + 2MnO2(s) + 2e⁻ → 2NH3­(aq) + Mn2O3(s) + H2O(l)
A secondary electrochemical cell (e.g. nickel-cadmium cell) can also facilitate chemical reactions through the introduction of electrical energy when being charged. This may NOT be included in the definition of electrochemical cell, because a primary cell (e.g. a zinc-carbon cell) CANNOT do so.


what the application of electrochemical cell is?
An electrochemical cell can derive electrical energy in an electrical circuit. In other words, an electrochemical can drive electron flow (or current) in an electrical circuit.


how the use of electrochemical cell is applied to solve the problem?
Electrochemical cell is applied to solve problem when you need a source of electrical energy for a direct current.