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Connie's class
Unit 2 9/30 notes
| Question | Answer |
|---|---|
| When one electron is "inserted" into one end of a conductor what happens to the other electrons in the conductor | The electron moves the electrons in the conductor forward through the conductor until one electron is ejected at the other end |
| What is the source for the external electrons | Power supply |
| What does the electron that was displaced from the conductor carrie | Kinetic energy to perform some kind of work |
| What causes the electrons to move in the conductor | A difference in potential energy must exist between two locationsin the conductor to make a "current" |
| What is the difference in potential energy betwen two locations | Potential Energy Difference |
| What does a potential energy difference create | A forrce between two locations in a conductor |
| What does Electromotive force (EMF) cause | The electrons to begin to move from an area of higher concentration (negative area) toward the area of lower concentration (positive area) |
| How long will the movement continue | Until an equilibrium of charge concentration is established throughout the substance |
| What happens when there is no more movemenet of the electrons | There is no Potential Energy Difference left |
| What is the unit of electromotive force | Volt |
| What is current intensity | Number of electrons passing a give point per unit of time |
| What is the unit of current intensity | Ampere |
| How much is 1 ampere | 1 Coulomb of charge (6.3x10^18) moving past a point per second |
| When electons move through the atoms of the conductor friction occurs which hinders movement | Resistance |
| What is resistance | The inherent acction of a substance which opposes the forward movement of current |
| What is the unit of Electrical Resistance | Ohm |
| What are two types of resistance | Inherent Resistance and Added Resistance |
| What is Inherent Resistance | Resistance due to the characteristics of the electrical conductor material itself |
| What are four factors affecting Inherent Resistance | Length of conductor, Cross-sectional area of conductor, What the conductor is made of, and Temperature of the conductor during current movement |
| How is the length of the conductor related to the inherent resistance | It is directly proportional |
| How is the cross-sectional area of a conductor related to the inherent resistance | It is inversely proportional |
| What does the material of a conductor do to the inherent resistance | The conductor property of conductor itself affects inherent resistance |
| How does the temperature of a conductor affect the inherent resistance | As the temperature of a conductor increases the inherent resistance increases |
| In addition to inherent resistance what else must the conductor contain | Some added resistance |
| What is Added Resistance | Resistance that is added to the inherent resistance using devices designed to create the additional resistance |
| What are two types of added resistance | Resistors and Rheostats |
| What is a Resistor | A device that has a fixed amount of resistance |
| What is a Rheostate | A device that has a variable amount of resistance |
| What is added resistance in a conductor called | Load |
Created by:
lclack04
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