P4a-sparks Flashcards
What happens when some materials are rubbed?
They attract other objects
Eg certain types of dusting brushes become charged and attract dust as they pass over it
How can insulating materials become charged?
When rubbed with another insulating material
What are the two kinds of charge?
Positive
Negative
What do like charges do?
Repel
What do unlike charges do?
Attract
What are electrostatic phenomena caused by?
The transfer of electrons which have a negative charge
What is a positive charge due to?
Lack of electrons
What is a negative charge due to?
Excess of electrons
What is static electricity?
Charges which are not free to move which causes them to build up in one place and it ends with a spark or shock when they do move
How can you get an electrostatic shock from synthetic clothing?
When clothes are dragged over each other or over your head, electrons get scraped off leaving static charges on both parts which lead to shocks as the charges rearrange themselves
How can you get an electrostatic shock from touching a door handle?
When you walk on an insulating material wearing insulating soles charge builds up on your body, then if you touch a metal door handle the charge flows via the conductor bd you get a shock
How is static electricity dangerous when in atmospheres with inflammable gases or high concentrations of oxygen?
Sparks could ignite the gases
Give an example of how static electricity can be a nuisance?
Dust particles are attracted to anything with the opposite charge like tv screens which are made out of insulators
How can the chance of receiving an electric shock be reduced?
- correct earthing
- use of insulating mats
- using shoes with insulating soles
- bonding fuel tanker to aircraft
How do anti static sprays and liquids work?
They make the surface of a charged object conductive which provides an easy path for charges to move away and not cause a problem
How do anti static cloths work?
They are conductive so they can carry charge away and not cause a problem
How do anti static sprays and liquids work?
They make the surface of a charged object conductive which provides an easy path for charges to move away and not cause a problem
How do anti static cloths work?
They are conductive so they can carry charge away and not cause a problem
How do anti static sprays and liquids work?
They make the surface of a charged object conductive which provides an easy path for charges to move away and not cause a problem
How do anti static cloths work?
They are conductive so they can carry charge away and not cause a problem
