Presentation on theme: "Electricity Unit 8, Chapter 20 Pre-unit Quiz Do the following sets of subatomic particles repel, attract, or do nothing? protonneutron proton Do nothing."— Presentation transcript:
Pre-unit Quiz Do the following sets of subatomic particles repel, attract, or do nothing? protonneutron proton Do nothing Repel Page 1
electronneutronelectronprotonelectron Do nothing Repel Attract Page 2
I. Electric Charges 1. Positive (+) 2. Negative (-) A. Types of electric charges B. Properties of electric charges 1. Like charges repel 2. Opposites attract ++ +- (Force of repulsion) (Force of attraction)
C. An object gains an electric charge by gaining or losing electrons + - + + + + + + + + + - - - - - - - - - Two neutral objects Positive objectNegative object
II. Static electricity A. Build up of electric charges B. There are three ways to separate electric charge.
The first method of separating electric charge: FRICTION before after Electrons transfer when two objects are rubbed against each other.
The second method of separating electric charge: Induction before after A neutral object is charged oppositely when brought near a charged object.
The third method of separating electric charge: Conduction before after contact allowed Electrons are transferred through contact.
Learn more C. Van de Graaff generator friction static electric field electroscope - detects electric fields static electric discharge ground wire Robert Van de Graaff
III. The flow of electricity A. Voltage (V) 1. Pushes the electrons through a wire (analogous to water pressure in a pipe) 2. Called potential difference 3. Measured in volts Bonus: Named after Count Alessandro Antonio Anastasio Volta Count Volta invented the battery.
4. Sources of voltage a. Batteries (chemical reaction) b. Solar cells (light) c. generator (mechanical/magnetic) solar cell generator
B. Current (I) 1. Flow of electrons through a wire (analogous to the flow of water in a pipe) 2. Measured in amperes or amps 3. Detected by an ammeter Bonus: Named after André Marie Ampère Made discoveries in electromagnetism concerning electric current