Electrostatics

1
Electrostatics

• Chapter 21-1

2
Electric Charge

• Explain the atom and the charges on an atom
• Neutrons
• Protons
• electrons

3
Static Electricity

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

4
Law of Electrostatics

• What charges attract?
• What charges repel?
• Opposite charges attract and like charges repel

5
Charging by Conduction

• Touch the uncharged object with the charged
  object
• Resulting charge is the same as the charging
  object
• Transfer of electrons

6
Charging by Induction

• The charging object and the uncharged object
  dont touch
• The resulting charge is the opposite
• A temporary charge

7
Electric Field

• The area around a charged object
• The area has the same charge at the charged
  object
• Strongest nearest the electrons

8
Conductors

• A material that allows electrons to move easily
  through it
• wont retain a charge
• Silver is the best, copper, metals

9
Insulators

• A material that wont allow electrons to pass
  through easily
• Wood, plastics, glass, water, air

10
Grounding

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

11
The Electroscope

• A device that detects a charge

12
Placement of Charges

• Charges build up at sharp points
• Charges are always on the outside of conductors

13
Lightning

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