The document discusses batteries, including the differences between DC and AC current, examples of battery types and the devices they power, how non-rechargeable and rechargeable batteries work and their advantages/disadvantages, battery safety, and questions for discussion. It explains that DC current flows in one direction from a battery while AC alternates, lists common battery types like lithium ion and their uses, and describes the chemical reactions that generate electrons in non-rechargeable batteries and how they are recharged.
Semiconductor is device whose conductivity lies between the insulator and conductor.There are two types of Semiconductors: Intrinsic and Extrinsic Semiconductors
This was a slideshow for a class we did at the Pasadena Public Library for children ages 8-12 to teach them about electricity and help them to construct paper circuits. You can view photos and videos from this class in our google drive folder: https://drive.google.com/open?id=0B2kplpFq1AeucGZWbHZqRWlCNTQ
This slide show holds resources I use to help elementary students build electrical circuits. Squishy Circuits are built with Play-Doh or homemade dough. Simple components are used: 6-volt battery packs, LEDs, buzzers, fans, conductive/nonconductive dough.
14 chemical effects of electric currentCHEKIT SHARMA
this is the best chapter in science as it is my favioratie as i love chemistry and even i think that the people who would view this will like so i request to plese like share and comment so ok today only this much is enough so i'll leave bye
Semiconductor is device whose conductivity lies between the insulator and conductor.There are two types of Semiconductors: Intrinsic and Extrinsic Semiconductors
This was a slideshow for a class we did at the Pasadena Public Library for children ages 8-12 to teach them about electricity and help them to construct paper circuits. You can view photos and videos from this class in our google drive folder: https://drive.google.com/open?id=0B2kplpFq1AeucGZWbHZqRWlCNTQ
This slide show holds resources I use to help elementary students build electrical circuits. Squishy Circuits are built with Play-Doh or homemade dough. Simple components are used: 6-volt battery packs, LEDs, buzzers, fans, conductive/nonconductive dough.
14 chemical effects of electric currentCHEKIT SHARMA
this is the best chapter in science as it is my favioratie as i love chemistry and even i think that the people who would view this will like so i request to plese like share and comment so ok today only this much is enough so i'll leave bye
In this presentation we learn basics of how the lithium-ion works and reacts with the environment to produce a unique source of energy storage device called battery.
In this presentation we will deal with:
Introducing Lithium-Ion Battery
It’s Construction
It’s Working
It’s Cell Reactions
It’s Advantages & Disadvantages
It’s Application, etc.
Naman Dilip Nandurkar
Content
Introduction & How It Works
History
Interesting Facts
Different Types Of Batteries
Selecting the right battery for your application
Application
Effect On Envorment
Future Of Batteries
A lithium-ion battery (sometimes Li-ion battery or LIB) is a member of a family of rechargeable battery types in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging. Li-ion batteries use an intercalated lithium compound as one electrode material, compared to the metallic lithium used in a non-rechargeable lithium battery. The electrolyte, which allows for ionic movement, and the two electrodes are the constituent components of a lithium-ion battery cell.
This will cover chapter one and two of medical physics.Slides to help students in electrotherapy medical physics part.will cover part from the book and internet source includes
Thermal effect of current
Chemical effects
Cell/batteries
Electronic tube
Diodes
Triodes
Electrolysis
Electrical burns
4. DC versus AC
• A direct current (DC) is one which goes
around and around in the same direction –
it is delivered from a battery
• An alternating current (AC) is one which
goes back and forth over and over again –
this is what we get from the mains supply
5. • If you look at a
battery you will see
two terminals
• One is a +ve called
the anode
• The other is –ve
called cathode
6.
7. Examples of different types of batteries
and where we use them
Appliance Battery material Battery type
Mobile phone Lithium ion Rechargeable
Modern car Lithium acid Rechargeable
Very old car Lead acid Rechargeable
Laptop Lithium ion Rechargeable
Television remote control Alkaline Non-Rechargeable
Watch Lithium iodide Non-Rechargeable
10. How do they work?
• When the two poles are connected the electrons
can flow
• As the chemicals are used up fewer electrons
are made so the battery is used up
• A chemical reaction occurs between the
electrolyte and the anode which produces
electrons
• The salt bridge is in the way so they cannot flow
• These electrons flow to the cathode where there
are few electrons but…
11. How do they work?
1. A chemical reaction occurs between the
electrolyte and the anode which produces
electrons
2. These electrons flow to the cathode where
there are few electrons but
3. The salt bridge is in the way so they cannot
flow
4. When the two poles are connected the
electrons can flow
5. As the chemicals are used up fewer electrons
are made so the battery is used up
12. Why do we use them?
• Little current (like
remote controls)
• Rarely used items
(torches)
• They are cheap
• Stay charged for
longer
• …bad for the
environment!
13. Rechargeable batteries
• Cells in rechargeable batteries are called
secondary cells
• These are mostly used in portable items
that are used regularly, such as mobile
phones and computers
• The chemical is used up as the battery is
used but the process is reversible by
applying an electrical current
14. Safety hazards
• Dead batteries must be disposed of safely
• Some batteries contain toxic mercury that
may leak into the environment
• Leaking batteries may also cause burns if
the acid comes into contact with the skin
• In some areas of the UK, all types of
battery can be recycled
15. Questions
• Explain the difference between a
rechargeable and a non-rechargeable
battery. Give five examples of each
• Draw a labelled diagram of a primary cell
• Discuss with a partner the advantages and
disadvantages of rechargeable and non-
rechargeable batteries