Electricity is a force that holds together atoms, molecules, solids and liquids. You can have: “bits” of positive electricity or “Bits” of negative electricity
There are two main types of electricity:
• STATIC ELECTRICITY: Bits of positive or negative electricity that stays still
When two different insulating materials are rubbed together they become electrically charged.
Negative charges (electrons) rub off one material onto the other.
The material which gains negative charges becomes negatively charged.
The material which loses negative charges becomes positively charged.
• ELECTRIC CURRENT: Bits of positive or negative electricity that moves around in a wire
BBC Bitesize: current and voltage (click here)
Uses and safety of static electricity
Static electricity can be used in photocopiers and spray painting.
A charged object can be discharged by connecting it to earth with a conductor.
Static electricity can be dangerous (e.g. lightning). If the voltage becomes too great the negative charges can jump a gap causing a spark. This spark could ignite a flammable liquid nearby.
How do we make electricity? (click here)
Electricity lecture notes by Boardworks