# Shared Flashcard Set

## Details

Electricity
Basics of Electricity
32
Physics
04/26/2009

Term
 Electrostatics
Definition
 Nonmoving electric charges,usually refers to electrons.
Term
 Electrified (Definition)
Definition
 Having too few or too many electrons. Created by movement of electrons.
Term
 Creating Electrification (3 things)
Definition
 Contact,Friction,Induction
Term
 Static Charge
Definition
 Positive charge created by electrons being removed;then,repulsion of like charge.
Term
 Static: A comb becomes a magnet how?
Definition
 Comb accumulates extra e-, e- in paper repulse from negative comb, the end of paper close to comb is now positive, unlike charges attract.
Term
 Static Charge:What is the ultimate electric ground?
Definition
 Earth; collects stray negative charges.
Term
 Electricity Unit (Fundamental Unit)
Definition
 Coulomb(C)
Term
 Electrostatic Laws
Definition
 1.Unlike charges attract;Like charges repel2.Coulombs law:electrostatic force directly proportional to charges;Inverse proportion to square of distance btw.3.Charge is evenly distributed throughout or on a surface of a conductor.4.Charge is concentrated on sharpest curve of conductor.
Term
 Electric Potential
Definition
 Ability to do work; repulsion,electrons moving along a wire.
Term
 Unit of Electric Potential
Definition
 Voltage
Term
 Electrodymics
Definition
 Moving electric charges (along copper wire,first must apply a potential difference). Electric current/electricity.
Term
 Four Electrical States of Matter
Definition
 Conductors, Insulators, Semiconductors, Superconductors.
Term
 Conductors
Definition
 Substance through which electrons flow easily (most metals,copper,aluminum,water).
Term
 Insulators
Definition
 Does not allow electrons to flow (glass,clay,earthlike materials,rubber).
Term
 Semiconductors
Definition
 Sometimes behaves like conductor;sometimes like insulator,Important to computer technology.
Term
 Superconductors
Definition
 No resistance to electron flow,only at very cold temp.
Term
 Electric Circuits (definition)
Definition
 Closed pathway for electron flow
Term
 Factors affecting the electron flow through the wire or RESISTANCE...
Definition
 Diameter of wire, number of circuit elements (lights,outlets)
Term
 Unit of electric current
Definition
 Amperes(A)
Term
 Unit of electric potential
Definition
 Voltage
Term
 Unit of electric resistance
Definition
 Ohms
Term
 Unit of electric charge
Definition
 Coulomb(C)
Term
 Ohm's Law
Definition
 V = IR, "voltage across a circuit equals current times resistance."
Term
 Types of circuits
Definition
 Series, Parallel
Term
 Series Circuit
Definition
 All circuit elements connected in a line along the same conductor; one wire.
Term
 Parallel Circuit
Definition
 Elements connected at their ends; two wires.
Term
 In Series, if one light burns out on a xmas tree, what happens?
Definition
 Entire Entire string goes out. (one wire connecting each light.)
Term
 In Parallel, if one light burns out on a xmas tree, what happens?
Definition
 Others remain lit.(two wires connecting each light)
Term
 Direct Current (DC)
Definition
 Electrons flow in one direction along conductor (straight line).
Term
 Alternating Current (AC)
Definition
 Electrons oscillate back and forth (sine wave).
Term
 Unit of Electric Power
Definition
 Watts (W)
Term
 Xray system operates at what kW?
Definition
 20-150kW
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