What happens when insulating materials are rubbed against each other?

What particle is rubbed off between each insulating material when they are rubbed together?

How does one of the insulating materials become negatively charged?

How does one of the insulating materials become positively charged?

If two electrically charged materials, which carry the same charge, are brought near to each other what will happen?

If two electrically charged materials, which carry different charges, are brought near to each other what will happen?

What is electric current?

What are mains electricity cables made from and why?

What colour is the neutral wire?

What colour is the Earth wire?

What colour is the live wire?

What is direct current (d.c.)?

What is alternating current (a.c.)?

What is the frequency and potential difference of mains electricity?