Dc Theory Chapter 2-3 Lessons 1-4

Front 1

An electron has a what

Back 1

Charge with negative polarity

Front 2

Matter

Back 2

All things in Universe

Front 3

Matter is either a ĵpĵll

Back 3

Solid, liquid,gas

Front 4

Element

Back 4

Is smallest form of matter

Front 5

The smallest piece of an element is

Back 5

The atom

Front 6

Adams have 3 main parts and they form the what.

Back 6

Protons neutrons electrons. Form the nucleus

Front 7

Subparticals of tbe Proton And nutrons are called

Back 7

Quarks

Front 8

Number of protons equals what

Back 8

Elements atomic number

Front 9

Valence ring is the what

Back 9

The outer ring

Front 10

The valence ring contains

Back 10

8 electrons

Front 11

Conductor

Back 11

Allows current to flow easy

Front 12

Insulator

Back 12

Strongly resist the flow of electricity

Front 13

Semi conductor

Back 13

Number of electrons In valance ring

Front 14

The valence ring that is full is

Back 14

Very stable

Front 15

Semiconductors have how many electrons in outer ring

Back 15

4

Front 16

Heat causes what

Back 16

Change in conductivity

Front 17

6 methods that are known to force electrons from violence ring

Back 17

Friction, chemical, heat, Pressure, light, magnetism.

Front 18

When electricity is used it can create what

Back 18

Chemical action, heat, pressure, light, magnetic fields

Front 19

The Is friction created by rubbing the objects together is

Back 19

Triboelectricity

Front 20

Friction is a source of

Back 20

Static electricity

Front 21

Batteries are divided between

Back 21

Primary cells and secondary cells

Front 22

The most common chemical source of electricity is the

Back 22

Battery

Front 23

Secondary cells can what

Back 23

Be recharged

Front 24

To dissimilar metals that are heated is known as

Back 24

thermoloelectricity

Front 25

Thermalcouple

Back 25

Increase in temperature that cause electron transfer

Front 26

Electricity derived from pressure is

Back 26

Piezoelectric

Front 27

Light has small particles of energy called

Back 27

Photons

Front 28

Photoconductive

Back 28

When photons bombard a normally poor conductor and are freed from shell.

Front 29

Electroluminescence

Back 29

Materials that give off light when current is passed

Front 30

Current flow goes from

Back 30

Negative to positive

Front 31

Impacity

Back 31

Max current a cable can carry without exceeding temperature

Front 32

You can place a switch at

Back 32

Any point from the load

Front 33

A switch allows

Back 33

Current to flow or stop

Front 34

A relay is

Back 34

A set of contacts that move when signal is relayed

Front 35

When measuring a cross a switchit should read

Back 35

0 ohms closed

Front 36

1 mil equals

Back 36

0.001 inches

Front 37

Conductor diameter

Back 37

D(inches)x1000^2

Front 38

Measure conductor using mm scale

Back 38

A=(d/2)^2 x pie

Front 39

Resistivity is

Back 39

Specific resistance

Front 40

Resistance

Back 40

R=k x L / cm

Front 41

Voltage drop

Back 41

Vd= 2[k x L x I ]/cm