Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to...
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Transcript of Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to...
![Page 1: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/1.jpg)
Cells and Batteries
![Page 2: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/2.jpg)
Cells and Batteries•Electrons are involved in static charge –
we know!•How does this relate to electronic devices?•Electric circuits!▫A closed path along which electrons that are
powered by an energy source, can flow
![Page 3: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/3.jpg)
Cells and Batteries•Most batteries used today are
similar to Alessandro Volta’s “Voltaic pile”
•Voltaic cells generate an electric current by chemical reactions between 2 different metals separated by a conducting solution
•Battery = a connection of 2 or more cells
•Clarification: a regular AA battery is technically a cell
![Page 4: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/4.jpg)
Batteries•A battery is essentially a can full of chemicals
that produce electrons
•2 terminals (electrodes): +ve and –ve▫Made of different metals▫Immersed in electrolyte (solution or paste)
• If you connect a wire between electrodes, electrons will flow (from -ve end to +ve) as fast as they can▫Wears out the battery quickly▫Dangerous ▫Use a load
![Page 5: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/5.jpg)
Batteries• Inside battery, a chemical
reaction produces ions▫Takes place at surface of
electrode
•Electrons travel through connecting wire to positive electrode▫Attracted to +ve electrode
•The -ve metal disintegrates slowly▫Limits the life of a cell
![Page 6: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/6.jpg)
Types of CellsDry Wet
• Electrolyte is a paste• Uses zinc and carbon• Major advance came with
alkaline cells More expensive Last longer
• Electrolyte is a liquid• Most use sulfuric acid
![Page 7: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/7.jpg)
Types of CellsDry
Wet
![Page 8: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/8.jpg)
Types of Cells
•Primary – can be used only once•Secondary – can be recharged many times▫Electric current is passed in opposite
direction through cell Reverses the chemical reactions, restoring
cell to full capacity•Fuel cell – generates electricity through
chemical reactions of fuel that is stored outside the cell▫Eg. Hydrogen stored in a tank combined
with Oxygen
![Page 9: Cells and Batteries. Electrons are involved in static charge – we know! How does this relate to electronic devices? Electric circuits! ▫ A closed path.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5f5503460f94b59d2a/html5/thumbnails/9.jpg)
For Homework:
•Read pg 511-513
•Answer questions p. 513 #4, 5, 7