Electricity

identify common materials that are electrical conductors

copper, aluminium, silver and gold

identify common materials that are electrical insulators

rubber, plastic, glass, ceramic, and dry wood

how can insulating materials be charged by friction?

Two insulators are rubbed together

friction causes electrons to move from one to the other and become charged

Material that loses electrons becomes positively charged

material that gains electrons becomes negatively charged

magnitude of charge on each material is equal- they lose/gain the same number of electrons

explain the uses of electrostatic charges in a photocopier

image of document is projected onto a positively charged plate

light falls onto the plate, the charge leaks away

negatively charged toner particles are attracted to the remaining positive areas

paper is placed over the plate, toner is transferred to it- making the photocopy

explain the uses of electrostatic charges in inkjet printers

droplets of ink are charged and pass betwen two charged metal plates

one has a positive charge and the other a negative charge

droplets are attracted to the plate with the opposite charge

and replled by the plate with the same charge

deflected towards a specific place on the paper

What are the potential dangers of electricity?

Damaged insulation

Overheating of cables

Electric shock