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Connie's class

Unit 2 9/25 notes

What is the first law of Electrostatics Like charges repel, Unlike charges attract
What is the second law of Electrostatics Electrical charges reside only on the external surface of a charged object
What is the third law of Electrostatics Force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance bewteen them
What is another name for the third law of Electrostatic Coulomb's Law
What are two types of Electrical currents Alternating Current and Direct Current
What is Alternating Current Current that continuously changes direction (back and forth) as it moves through a substance
What is Direct Current Current that moves through a substance continously in the same direction
What kind of states of matter can a negative charge move through All states of matter (solids, liquids, and gages)
What kind of states of matter can a positive charge move through Liquids and gases
What kind of charges can only move through solid materials Negative (electrons)
As current electricity moves through matter what does the charge encounter Friction through contact with each other and contact with the atoms of the matter itself
What is the friction between the charges and friction between currents and the atoms of the matter itself Resistance
What does the friction do to the current Robs the current of some of its energy
What will electrical charges (positive or negative) follow The path of least resistance
What are the electrical classifications of matter Conductors, Insulators, Semiconductors, and Superconductors
What is a conductor Any substance which permits electrical charges to move very easily through that substance
What are examples of conductors Gold, Silver, Copper, and Aluminum
What is an insulator Any substance that blocks the flow of charges through the substance
What are examples of insulators Glass, Rubber, Plastic, and Wood
What is a semiconductor A substance that acts as a conductor under certain conditions ans as an insulator under other conditions
What are examples of semiconductors Germanium and Silicon
What is a superconductor A substance that has zero resistance when operated at extremely low temperaures
What are examples of superconductors Niobium and Titanium
For 150 years after electricity was discovered in 1755 (by Benjarmin Franklin) how did people think that currents moved through a solid It was theorized that electrical current moves through a solid from a positive to a negative point
When was it determined that current moving in a solid actualy moves from negative to positive In the 20th century
What are the official names for the movement types Concept of Conventional Flow, and Concept of Electron flow
What is the Concept of Conventional Flow Electricity moves from a positive to a negative ex. electricians
What is the Concept of Electron Flow Electricity moves from a negative to a positive ex. radiographers
What is the Electron Flow concept used to described Electrical current movement in radiologic equipment
What do we reffer to as positive Less negative
Created by: lclack04
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