Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Electricity Def'ns
| Term | Definition |
|---|---|
| Electric Charge | Indicates if a body has an excess or deficiency of electrons |
| Conductor | Any substance through which electric charge can flow |
| Insulator | Any substance through which electric charge can not flow |
| Point Discharge | Where ions in the air are either strongly attracted or repelled from the tip of a charged conductor and move towards or away from it |
| Electric Field | The region of space in which electric charges at rest experience a force (called an electrostatic force) |
| Electric Field Line | Line along which a positive charge would move if place in an electric field |
| Electric Field Strength | Force per unit positive charge at a point in an electric field |
| Potential Difference | Work done in moving a charge of one coulomb from one point to another; also known as voltage |
| Electromotive Force | A voltage that is applied to a circuit |
| Capacitor | Electrical device capable of storing electric charge |
| Capacitance | The ratio of the charge on a capacitor to the potential difference applied across it |
| Electric Current | Flow of electric charge |
| Resistance | The ratio of voltage across a body to the current through it |
| Resistor | Device that converts electrical potential energy to some other form |
| Resistivity | A constant associated with the resistance of a body; equal to the product of the resistance of a body and its cross-sectional area divided by its length |
| Semiconductor | Substance whose resistivity is between that of a good conductor and good insulator |
| Doping | The addition of a small amount of another element to a pure semiconductor to increase its conductivity |
| Intrinsic conduction | Movement of charge through a pure semiconductor |
| Extrinsic conduction | Movement of charge through a doped semiconductor |
| Electron Hole | The lack of an electron at a position where one could exist in an atom |
| N-type | Semiconductor where doping produces more free electrons available for conduction |
| P-type | Semiconductor where doping produces more holes available for conduction |
| p-n Junction Diode | Semiconductor device that allows current to flow in one direction only |
| Light Dependent Resistor | Semiconductor device whose resistance varies from a high value in the dark to a lower value in bright light |
| Thermistor | Semiconductor device whose resistance decreases rapidly with increasing temperature |
| Magnetism | When certain materials exert attractive or repulsive forces on other metals |
| Magnetic Field | Region of space where magnetic forces can be felt |
| Magnetic Field Line | Indicates the direction a magnetic north would travel in a magnetic field if free to do so |
| Magnetic Flux Density | Measure of the strength of a magnetic field |
| Ampere | Constant current which, if maintained in two straight parallel conductors of infinite length, of negligible cross section and placed one meter apart in a vacuum, would produce a force on each conductor of 2x10^-7 newtons per metre length |
| Magnetic Flux | Total amount of magnetic field in a given region; it is the product of magnetic flux density and area |
| Electromagnetic Induction | Where an emf is induced by a change in the magnetic flux linking a circuit |
| Alternating Current | Electric current whose direction reverses periodically |
| Direct Current | Electric current that flows continuously in the same direction |
| Mutual Induction | Where a changing magnetic field in one coil induces an emf in another coil |
| Transformer | Electrical device used to change the voltage of a.c. power supplies |
| Self-induction | Where a changing magnetic field in a coil induces an emf in the coil itself |
| Inductor | An electrical device used to induce a back emf |
Created by:
conordesmond
Popular Physics sets