Static Electricity

Energy Energy:the ability to do work. Energy cannot be created or destroyed. It can only be transformed. Forms of Energy: – heat – light – sound – mechanical – Electrical – hydraulic Electricity:Is a form that energy may take. Static Electricity:Where a charge remains stationary in an object.

Law of Electric Charges: Like charges repel each other Unlike charges attract each other (opposites attract)‏ Charged objects will be attracted to neutral objects Transfer of Charge:There are 3 ways charge can be transferred: Friction Contact Induction

Charging by Friction Charging by Friction: when electric charges are transferred by a rubbing action or friction. Transfer of electric charges as you walk across a carpet, shows the movement of the electrons (which have the negative charge).

Electrostatic Series Scientists have developed a list known as the Electrostatic series Chart to determine the kind of electric charge produced on each substance when any 2 substances are rubbed together.

Electrostatic Series Chart GlassWeak Human hair Nylon Wool Fur Silk Cotton Rubber Polyester Foam Polyethylene EboniteStrong

Example: If nylon socks and cotton shirts were dried together in a clothes dryer, which becomes positive and which becomes negative? Nylon: positive, cotton: negative The difference attracts each other and causes static cling!

Insulators and conductors Insulators: a substance in which electrons cannot move freely from atom to atom: ex. Fur, silk, wood, rubber, glass, plastic Conductors: a substance in ehich electons can move freely from one atom to another. ex. Silver, copper, magnesium, iron.

Grounding Discharge to remove any electric charges on an object. Can be done by connecting these objects to the earth (which is a good conductor)‏ Objects are then grounded The earth is so large that it removes all the charge. Only the electrons can move.

Questions: P.406 # 1-4 P. 407 # 5, 7, 8. P.410 # 2-6.