Electric Charge

Question 1

What are electrical conductors ?

Answer 1

They are a material that allows a current to pass through them

Question 2

How do materials conduct current ?

Answer 2

They have ‘free’ electrons, because current is a flow of electrons

Question 3

What are insulators ?

Answer 3

They are materials that do not allow a current to flow through them

Question 4

What can you NOT do to charge ?

Answer 4

You cannot destroy charge you can only move it

Question 5

What is NAFPIGS ?

Answer 5

• negative
• amber
• • fur
• positive
• if
• glass
• • silk

Question 6

What is an induced charge ?

Answer 6

If a charge is induced on a neutral object then it can attract or repel electric charges

Question 7

What is triboelectricity ?

Answer 7

A type of electricity generated by friction

Question 8

What is the electrostatic phenomena ?

Answer 8

• this is an event where static electricity has a specific effect : e.g. An electric shock
• electrons move from one material to another, the material with a negative charge will then look for some way to earth its charge, which can cause an electric shock

Question 9

Dangers of triboelectricity

Answer 9

• when an aircraft is flying, the air/clouds it passes through create friction and the aircraft becomes charged through triboelectricity
• this means when the plane is being re-fuelled, it still has a charge, this can cause a spark, as the charge jumps from the aircraft to the fuel igniting it

Question 10

What can stop the dangers of triboelectricity?

Answer 10

• A earthing wire. This means hat a wire farting a current is attached to the aircraft.
• This means there is a safe route for the charge to escape from, this discharges the plane, making it safe to re-fuel

Question 11

What are the 3 uses of charges ?

Answer 11

• electrostatic precipitator
• electrostatic paint spray
• ink-jet printer

Question 12

Describe an ink-jet printer

Answer 12

• the ink-jet printer ejects ink

* the charged plates, which use different amounts of charge to steer the ink to the correct place in the page

Question 13

Describe an electrostatic precipitator

Answer 13

• when the soot rises it gets a negative charge from the charging wire
• when it rises further up the chimney it gets attracted to the positively charged collecting plates
• where it collects all the spot an almost non of the soot gets into the atmosphere

Question 14

Describe an electrostatic paint spraying

Answer 14

• the paint is positively charged because the electrons are transferred to the gun when the paint passes through it
• the object is negatively charged, the positively charged paint is attracted to the negatively charged object
• the object is fully covered by the paint because each droplet repels each other so fully covers the object

Question 15

Why is electrostatic paint spray effective ?

Answer 15

• fully covers the object
• no wastage
• no drop marks or streaks
• nicer finish
• quick
• less money