static charge Flashcards
1
Q
describe the production of static electricity by rubbing surfaces
A
- when insulating materials are rubbed against each other
- negatively charged electrons are rubbed off one material and on to the other
- the material that gains
electrons becomes negatively charged - the material that loses
electrons is left with an equal positive charge
2
Q
what happens when two electrically charged objects are brought close together?
A
- they exert a force on each other
3
Q
which charges move, how are the different charged produced?
A
- ONLY electrons
- positive caused by electrons moving away
- negative caused by more electrons moving on to them
4
Q
describe the production of sparking
A
- as electric charge builds on an object, the potential difference between the object and earth increases
- if the potential difference gets large enough, electrons can jump across the gap, causing a spark
- can also jump to any earthed conductor
