Sparks Flashcards
(21 cards)
If two insulating materials are rubbed together what is the name of the charge?
Static electricity
How can an insulating material become electrically charged?
If it is rubbed with another insulating material
What is static electricity?
Electricity stays on the material and does not move
Why does the electricity stay on the material and not move?
It is due to the transfer of electrons
What charge do electrons have?
Negative
What happens to the electrons in static electricity?
Electrons transfer from one material to another - 1 material has a positive charge and 1 ,arterial has a negative charge
How do dusting brushes work?
The brushes get charged - they attract dust when they pass over it
How can an object be discharged?
By earthing it
What happens when an object discharges?
Electrons are transferred from the charged object to the earth.
What happens if you become electrically charged?
Earthing can result in you getting an electrostatic shock
How can some get an electrostatic stock by touching a water pipe?
Person charges by soles of feet and insulating floor e.g carpet rubbing together
Then touch water pipe e.g radiator which charge is earthed
Discharge occurs
SHOCK!
How can static electricity be a problem in flour mills and petrochemical factories?
They have atmospheres that contain extremely flammable gases/high concentrated areas
Discharge of static electricity (spark) - explosion
2 ways in which static electricity can be a nuisance?
- cause dirt and dust to be attracted to insulators e.g tv and laptop
- cause some fabrics to cling to skin
Two insulating materials with the same charge will ….. each other
Repel
Two insulating materials with different charges will ……. each other
Attract
What happens to the material that loses the electrons?
It becomes positively charged
What happens to the material that gains the electrons?
It becomes negatively charged
Atoms or molecules that become charged are then called ….
Ions
How can the chances of receiving an electric shock be reduced?
- ensuring appliances are correctly earthed
- using insulation mats effectively
- wearing shoes with insulating soles
Why do lorries that contain flammable gases, liquids or powders need to be earthed before unloading?
Friction can cause a build-up of charge - could lead to a spark - ignite flammable substances
How do anti-static sprays, liquids and cloths help to reduce problems of static electricity?
They prevent transfer of charge from one insulator to another
