How Batteries Work

1
How Batteries Work
2
A Battery

• A battery is an electrochemical cell known as a
  voltaic cell --a chemical reaction releases
  moving electrons

3
Whats going on

• The chemical reaction that generates electricity
  in a battery is known as oxidation-reduction
  reaction
• OXIDATION A substance loses electrons
• REDUCTION A substance gains electrons

4
2 Types of Batteries

• Dry Cell
• Wet Cell
• Both have electrolytes a liquid substance which
  acts as a medium to conduct electricity.

5
Wet Cell

• A wet cell electrolytes are contained in a
  liquid.

6
A Dry Cell

• A dry cells electrolytes are contained in a
  low-moisture paste.

7
Each Battery Contains
Anode-oxidator releases electrons
Cathode-reducer gains electrons These are
known as electrodes
8
Separator or Bridge

• Every Battery needs a bridge which prevents the
  buildup of excess charge at the two electrodes
• Without the bridge the charge buildup at the
  electrodes would prevent the oxidation-reduction
  reactions from continuing

9
Normal A Battery
10
Batteries vs Wall Socket

• Batteries produce Direct Current (DC)
• Electrical Outlets produce Alternating Current
  (AC) where the electrons move back and forth

11
How do I recharge my phone

• nickel-cadmium and lithium can be recharged
• the chemical reactions in a rechargeable battery
  are reversible when the battery is discharging
  the reactions go one way and the battery gives
  out power
• when the battery is charging, the reactions go
  in the opposite direction and the battery absorbs
  power.