3.4 Generation Of Electricity Flashcards
How is light energy transferred into electricity?
When light strikes certain semiconductors it may cause charge separation which generates electricity
How does charge separation generate electricity?
In the semiconductor the atoms are joined by covalent bonds and when the light strikes it an electron is set free leaving a hole. Once the electron is used round a circuit it comes back to fill the hole
What are the main parts of photovoltaic cell (solar panel)?
- n-type
- p-type
- p-n junction
How does thermal energy stored in a material get transferred directly to electrical energy?
When you heat two different metals the electrons move at different speed causing one to be positive and one to be negative
How does friction create electricity?
When two materials are rubbed together it causes electrical charges to separate and created an EMF
How is electricity created by using pressure?
Exerting mechanical stress on certain solids such as crystals causes a separation of charges creating an EMF
How does chemical action create electricity?
By immersing two different metals in an electrically conducting liquid it generates a charge separation
How is electricity generated by magnetism and motion?
When a conductor moves through a magnetic field charge separation is produced
Where does an electric field between two bodies tend to be strongest?
At points and corners
