Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
41 Cards in this Set
- Front
- Back
An electron has a what |
Charge with negative polarity |
|
Matter |
All things in Universe |
|
Matter is either a ĵpĵll |
Solid, liquid,gas |
|
Element |
Is smallest form of matter |
|
The smallest piece of an element is |
The atom |
|
Adams have 3 main parts and they form the what. |
Protons neutrons electrons. Form the nucleus |
|
Subparticals of tbe Proton And nutrons are called |
Quarks |
|
Number of protons equals what |
Elements atomic number |
|
Valence ring is the what |
The outer ring |
|
The valence ring contains |
8 electrons |
|
Conductor |
Allows current to flow easy |
|
Insulator |
Strongly resist the flow of electricity |
|
Semi conductor |
Number of electrons In valance ring |
|
The valence ring that is full is |
Very stable |
|
Semiconductors have how many electrons in outer ring |
4 |
|
Heat causes what |
Change in conductivity |
|
6 methods that are known to force electrons from violence ring |
Friction, chemical, heat, Pressure, light, magnetism. |
|
When electricity is used it can create what |
Chemical action, heat, pressure, light, magnetic fields |
|
The Is friction created by rubbing the objects together is |
Triboelectricity |
|
Friction is a source of |
Static electricity |
|
Batteries are divided between |
Primary cells and secondary cells |
|
The most common chemical source of electricity is the |
Battery |
|
Secondary cells can what |
Be recharged |
|
To dissimilar metals that are heated is known as |
thermoloelectricity |
|
Thermalcouple |
Increase in temperature that cause electron transfer |
|
Electricity derived from pressure is |
Piezoelectric |
|
Light has small particles of energy called |
Photons |
|
Photoconductive |
When photons bombard a normally poor conductor and are freed from shell. |
|
Electroluminescence |
Materials that give off light when current is passed |
|
Current flow goes from |
Negative to positive |
|
Impacity |
Max current a cable can carry without exceeding temperature |
|
You can place a switch at |
Any point from the load |
|
A switch allows |
Current to flow or stop |
|
A relay is |
A set of contacts that move when signal is relayed |
|
When measuring a cross a switchit should read |
0 ohms closed |
|
1 mil equals |
0.001 inches |
|
Conductor diameter |
D(inches)x1000^2 |
|
Measure conductor using mm scale |
A=(d/2)^2 x pie |
|
Resistivity is |
Specific resistance |
|
Resistance |
R=k x L / cm |
|
Voltage drop |
Vd= 2[k x L x I ]/cm |