如何製造蓄電池

Dry batteries, or using a more specific term, electrochemical cells, are something made by chemicals such that electricity is produced due to the flow of electrons through the external circuit by redox action.

Each electrochemical cells consists of two half cells connected in series by a conductive electrolyte. Each cell has a positive electrode (cathode), and a negative electrode (anode). These do not touch each other but are immersed in a solid or liquid electrolyte. The materials are enclosed in a container, and a separator between the electrodes prevents the electrodes from coming into contact (such it electrons will flow through the external circuit)

An example is given below:

圖片參考：http://upload.wikimedia.org/wikipedia/commons/e/e3/Galvanic_cell.png


Wet betteries, or what we call simply electricity (usually refering to those used in a household) is produced directly from a power plant, and the electricity is carried through via overhead cables. To put it simple, there is a power source[1] which drive a motor. When the motor moves, the kinetic energy changes to electrical energy, which then carry through cables[2]. When we the electrical appliance to the socket, electricity is provided for the load to work.

[1]There are many kind of power source, like neclear energy, burning of fuels, or other natural elergy source
[2]Before electricity is carried through, it is stepped up; when electricity reaches household it is stepped down

Hope the above information helps
By 小儒