P11 - Static Electricity Flashcards
direct current is the movement of charge
C - in one direction
the particles that flow in the metal wire are
B - electrons
explain how the plastic is charged by rubbing
- electrons removed by friction
- transferred to plastic
describe the charge on the cloth
- opposite to charge on plastic
- but equal to charge on plastic
this is because the dust particles …
C - gain electrons
explain why the dust particles settle on the metal plates
- force of attraction
- plates have opposite charge to dust
state what happens to the charge on the dust particles when they settle on the metal plate
- transferred to plate
explain why charge does not build up on the metal plates
- metal is a conductor
- charge moves through the plate
- towards the earth (becomes earthed)
explain how charging the door helps paint to form even coating on both sides
- negatively charged door attracts positively charged paint droplets
- therefore paint droplets follow lines of force and coat both sides of the door
explain how an aircraft can become electrically charged as it flies through the air
- friction between the aircraft and air
- causes electron transfer between aircraft and air
which of these diagrams shows how the charge is distributed on the metal disk
B
explain why the disc has a now overall positive positive charge
- negative charges move from metal disc to earth
which row shows the correct combination of the charges
B - negative — positive
explain how rubbing the comb with a dry cloth gives the comb a positive electric charge
- friction between cloth and comb
- transfer of electrons from plastic comb to cloth
- electrons carry negative charge
- leaving excess positive charge on comb
explain how the positively charged plastic comb picks up the small pieces of paper
- negative charge is induced
- on the part of paper closest to comb
- opposite charges attract
explain how rubbing silk charges the glass
- charges move
- because of friction
explain how the silk becomes charged
- negative electrons rubbed off glass
- giving silk negative charge
Which diagram
A
give one reason why earthing reduces risk of fire
- earth wire discharges aircraft to prevent sparking which could cause a fire
the cloth has become positively charged because
A - negative moved from cloth to rod
explain why the strips behave in this way after they are rubbed with a cloth
- they repelled
- because they had like charges
explain why this build up could be dangerous
- charges are separated
- possibility of spark
- could ignite the fuel
