Cells and BatteriesEngr. Maria Romina P. Angustia

Electrical Cells

• An Electrical Cell is a power generating device which converts the stored chemical energy into electrical energy.

• A single unit of electro-chemical generator.

Batteries

• The combination of several cell units connected electrically.

• Several cells are combined and connected electrically in series or parallel to form a battery which have two main terminal electrodes one Positive and one Negative.

Series Connected Batteries:

• Figure 1: Series connection of four cells.Adding cells in a string increases the voltage; the current remains the same.

Cells must be connected the right way round if their voltages are to add up. If a cell is the wrong way around, then it will push against the others and we have to subtract its voltage.Look at the batteries below. They are all made from 1.5 volt cells. In each case, decide what its voltage will be. Choose the correct voltage from the drop down list. 

Parallel Connected Batteries• Figure 2: Parallel

connection of four cells.With parallel cells, current handling and runtime increases while the voltage stays the same.

Series-Parallel Connected Batteries