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Why do I need a battery?
Chapter 7 Section 2
What does a battery do?
• Static discharge is the moving of electrons from one atom to another.
• In order to keep the electrons moving through the circuit, there has to be something that causes a push, or a voltage difference- a battery does just that…
How do batteries work?
• Batteries create an uneven level of electrons which causes the electrons to move from a high concentration to a low concentration…
• This is also known as the voltage difference..
Dry-Cell Batteries
• Where do you find these?
• Name at least three places you use these…
Dry Cell Batteries
• There are two main parts on a battery that creates the voltage difference…
• The positive and negative ends…• Do you know which is which ?
Parts of the Dry Cell
• Positive End • Plastic Insulator • Moist Paste • Carbon Rod • Zinc Container • Negative Terminal
How does a Dry Cell Work?
• When the circuit is closed, and the battery is connected, a chemical reaction starts the process.
• The chemical reaction with zinc and several other chemicals occurs in the moist paste.
How does a Dry Cell Work?
• The carbon rod acts as a conductor and transfers electrons.
• The carbon rod is not part of the reaction happening in the moist paste.
• But…the chemical reaction in the moist paste does cause the carbon rod to become charged.
• This charge on the carbon rod creates a positive end.
• The negative end is made by the Zinc.
How does a Dry Cell Work?
• The voltage difference between the positive and negative ends causes the current to flow.
• By connecting more batteries you increase the voltage difference.
• List three things that needs more than one battery to work…
Wet Cell Batteries…
• What is a wet cell battery?• A battery that contains two
connected plates made of different metals or metallic compounds in a conducting solution.
• Can you list three places you have seen or used a wet cell battery?
Parts of a Wet Cell Battery
• Positive end• Negative end• Lead Plate• Battery Solution• Partition• Lead dioxide plate
THE BATTERY WEBSITE
• http://www.energizer.com/learning/howbatterieswork.asp