Electrostatics Chapter 21-1

Electric Charge b Explain the atom and the charges on an atom b Neutrons b Protons b electrons

Transferring Charge b Why is an atom electrically neutral? b How can it become charged negatively? b How can it become charged positively? b What does static mean? b What is static electricity?

Conservation of Charge b Charge can be transferred from one object to another, but it cannot be destroyed

Law of Electrostatics b What charges attract? b What charges repel? b Opposite charges attract and like charges repel

Electric Field b The area around a charged object b The area has the same charge at the charged object b Strongest nearest the electrons

Comparing Electric & Gravitational Forces b Which is larger? b A thousand trillion trillion trillion times larger (10 36 )

Conductors b A material that allows electrons to move easily through it b won’t retain a charge b Silver is the best, copper, metals

Insulators b A material that won’t allow electrons to pass through easily b Wood, plastics, glass, water, air

Charging by Conduction b Charging by contact b Touch the uncharged object with the charged object b Resulting charge is the same as the charging object b Transfer of electrons

Charging by Induction b Charging at a distance b The charging object and the uncharged object don’t touch b The resulting charge is the opposite b A temporary charge

Paper Snips

Lightning b Explain how lightning forms b Where is it safe to be in a lightning storm? b Safe position if caught far from shelter

Thunder b Lightning produces both light and sound waves b Lightning produces great amounts of heat b Air temperature rises to 30,000 o C b Causing air to expand rapidly producing the sound waves.

Grounding b The process of neutralizing a charged object b Earth is a good ground because it is a good source or sink of electrons

The Electroscope b A device that detects a charge