Electronics Tutorial #4: Ohms Law

If you want to build your own electronic circuits, one law you must learn and know how to use is Ohms law. Ohms law lets you calculate the current and voltage through and across a resistor. The basic equation that Ohms law states is that voltage is equal to the product of current and resistance. In equation form:

Equation 1: V= IR

If you know the voltage across a resistor and the current through a resistor you can compute the value of the resistor. Similarly, if you know the resistor value and the current through the resistor you can compute the voltage across the resistor.  For example if you put 2 Volts across a 1 Ohm resistor, from Ohms law you calculate that the current is 1 Ampere.

If you don't want to do the hand calculations required for Ohms law, you can always use a circuit simulator. The LTSpice circuit simulator, is a free simulator, that you can use to calculate the voltage across and the current through a resistor. In the LTSpice circuit schematic below, a 10 Volt battery is placed across a 1000 Ohm resistor. Using Ohms law, you can calculate that the current through the resistors would be 0.01 Ampere or 10 mA. A mA (milliamp) is 1/1000th of an Ampere.

LTSPICE Ohms Law Circuit Simulation

There are many advantages of using the LTSpice circuit simulator to analyze a circuit. One advantage is that it eliminates calculation errors. The second advantage is that you can analyze complex circuits, that would take hours of hand calculations, in seconds.  The third advantage is that it facilitates learning and allows you to build intuition about circuit design.

For more information visit www.bookmarktutoring.com

Learning Links

LTSPICE Download

How to Get Web Certified Quickly ....

If you want to get certified in web programming or want to enter into one of the many code camps, you will need to know HTML, HTML5, Javascript, CSS, XML and many of the support frameworks and APIs like bootstrap, AngularJS, JQuery and even newer real time multichannel APIs  such as PubNub.

The task can be daunting if you don't have the right road map. BookMarkTutoring gives you the right road map and and the path that's been tested time and time again. With BookMark you get the right approach, the right course material, the right practice tests, the right technology and  the right tutor.

Our online tutoring program provides you  with your own personal tutor, a tutor you can screenshare with, phone, text or email ... with all your technical and career questions. You can count on your tutor having the answers to all your web programming questions.  And that's because BookMark Tutors have the best training in the industry. All of BookMark's web development tutors have completed and passed BookMark's  Web Development  Aptitude Battery Test. The test, divided into 12 modules consists of 5000 questions and 10 coding projects, ensures  that our tutors are not only the best, but up to date. Besides, knowing the fundamentals and advanced aspects of web programming, a BookMark Tutor, knows the coding tricks, coding pitfalls, and coding best practices. A BookMark Tutor also knows what development support tools will help you the most, the emerging tools that boost productivity the highest and  what books and what code examples will help you the most.

BookMark also has the resources you need to become top in your field. BookMark's hierarchical code database empowers our tutors to quickly, find, explain and compare the different code options you have for your design projects ..... from fad-ins to fade-outs, to carousals, slide shows and even multi-channel drawing boards, chat boxes and more and more.

BookMark Tutoring knows the academic world of Computer Science. At BookMark we review and analyze the Computer Science curriculum, textbooks and coding projects at all the leading trade schools, online schools and major universities. All so you can know what you will have to learn and what your colleagues will be learning.

And BookMark knows the web development market place. What APIs and frameworks are emerging, which ones are standard and which ones are falling out of favor.  And what types of coding ability are needed and what skills you will need to know. And we know the pay. BookMark keeps abreast of all these trends ..... all so you can have the right knowledge for the right decision ...... find out  more at BookMarkTutoring.com



BookMark's Tutoring Web Development Modules

User Interface

HTML ....... HTML5
CSS ........ CSS3
HTML5 Canvas with SVG

Bootstrap

Coding

XML
JavaScript
AJAX
JSON

Coding Frameworks and APIs

JQuery
JQueryMobile
AngularJS
PubNub

Learn to Edit Graphics with Google's Free Picasa Tool... Featuring Ms. Goose's Party Pictures

Find out how to make first run graphics edits with Google's Picasa tool at BookMarkTutoring.com. Crop, brighten, darken, get rid of shadows, tint, add subtitles and more. Enjoy the company of Ms. Goose and her staff.

In this lesson, Ms. Goose's party pictures are altered in Picasa.

How to Edit with Picasa Video URL: https://www.youtube.com/watch?v=SZs-7brLdi8&feature=youtu.be&hd=1

Ruby IO, File and Directory Reference Library for Online Tutoring

BookMarkTutoring.com

Ruby Reference Library Links 

Input, Output, Directory and File Operations in Ruby

Student Reference Library for BookMark's Online Ruby Tutoring

1. An Introduction: Basic File and Directory Operations in Ruby
2. An Introduction: Directory Create, Make and Delete
3. An Introduction: Files and Directories: Ruby Dir: How to Use Dir Function to Manipulate and Navigate Directories
4. An Introduction: Files and Directory Methods
5. An Introduction: Methods of Class Directory, Altering and Navigating Directories and Directory Files, Renaming
6. An Introduction Ruby File IO Primer - Part 1 - The File Class
7. An Introduction Ruby File IO Primer - Part 2 - The Dir Class
8. An Introduction Ruby File IO Primer - Part 3 - The Standard Library
9. An Introduction Ruby File IO Primer - Part 4 - Building a Clone of the Watchr Gem
10. An Introduction Ruby Introductory Slides
11. An Introduction to Web Crawling
12. An Introduction to Web Scraping
13. An Introduction to Working with Files and Directories
14. An Introduction Working with Files in Ruby

Command Reference

1. ARGF rewind
2. Arrays
3. Arrays
4. Arrrays
5. Blocks
6. Blocks
7. Button
8. Change Position on the Named File, chmod
9. Changes File Permissions Access Rights
10. Character Device File
11. Classes
12. Comments
13. Comprehensive Lising of Flie Classes with Signature and Description.
14. Dates and Times

Directory 

1. Delete File
2. Diectory Name of File
3. Diirectory
4. Directory
5. Directory
6. Directory
7. Directory Change Directory
8. Directory Change Root
9. Directory Close
10. Directory, Close Directory
11. Directory Delete
12. Directory Delete Directory
13. Directory, Entries
14. Directory Entries
15. Directory Exist
16. Directory Exist
17. Directory File
18. Directory For Each
19. Directory For Each
20. Directory Foreach
21. Directory foreach
22. Directory Getwd
23. Directory Glob
24. Directory Glob
25. Directory Glob
26. Directory Handling
27. Directory Home
28. Directory Inspect
29. Directory List
30. Directory Make Directory
31. Directory Methods
32. Directory Methods Doesn't Link
33. Directory Name
34. Directory New Directory
35. Directory Open
36. Directory Path
37. Directory, Path To
38. Directory, Path to Curent Working Directory
39. Directory Position
40. Directory Position
41. Directory PWD
42. Directory pwd
43. Directory Read Directory
44. Directory Reject
45. Directory Rename
46. Directory Rewind
47. Directory, Rewind Directory
48. Directory, Seek Directory
49. Directory Tell
50. Directory Unlink

1. File
2. File
3. File
4. File
5. File atime
6. File atime
7. File atime
8. File Attime
9. File basename
10. File BaseName
11. File bleockdev
12. File Block Dev
13. File Block Size
14. File blockdev
15. File blocks
16. File Blocks
17. File blocksize
18. File Change Directory
19. File Change Mode
20. File Change Ownership
21. File Character Device
22. File chardev
23. File chmod
24. File chmod
25. File chown
26. File chown
27. File Close
28. File ctime
29. File ctime
30. File Delete
31. File dev
32. File Dev
33. File dev major
34. File dev minor
35. File directory
36. File Directory
37. File Directory
38. File Directory Executable File
39. File Directory Exist
40. File Directory File Class
41. File Directory File Match
42. File Directory File No
43. File Directory File Separator
44. File Directory Gets
45. File Directory gid
46. File Directory Group Owned
47. File Directory handle
48. File Directory hlink
49. File Directory Indentical
50. File Directory INO
51. File Directory Join
52. File Directory Lock
53. File Directory lstat
54. File Directory mkdir
55. File Directory mode
56. File Directory new
57. File Directory owned
58. File Directory path
59. File Directory pipe
60. File Directory popen
61. File Directory putc
62. File Directory puts
63. File Directory readlink
64. File Directory redev
65. File Directory rename
66. File Directory seek
67. File Directory set encoding
68. File Directory setgrid
69. File Directory setuid
70. File Directory size
71. File Directory socket
72. File Directory split
73. File Directory stat
74. File Directory sticky
75. File Directory String IO
76. File Directory subclass file
77. File Directory symlink
78. File Directory sysread
79. File Directory System Write
80. File Directory Tell
81. File Directory Temporary Directory
82. File Directory Truncate
83. File Directory UID
84. File Directory ungetc
85. File Directory unlink
86. File Directory unmask
87. File Directory utime
88. File Directory world readable
89. File Directory writable real
90. File Directory write
91. File Directory zero
92. File Each
93. File Each Byte
94. File Each Line
95. File End of File EOF
96. File executable
97. File Executale
98. File Exists
99. File Exists
100. File Exists or Nor
101. File expand path
102. File Expand Path
103. File Extension
104. File extension name
105. File File match
106. File Find
107. File flock
108. File Input and Output
109. File link
110. File lstat
111. File Matched
112. File Methods
113. File Methods
114. File Methods with Mini Snippet Code Examples Comprehensive
115. File mp3 file
116. File mtime
117. File mtime
118. File mtime
119. File Name
120. File new
121. File new
122. File New
123. File Number
124. File open
125. File Open
126. File owned
127. File path
128. File path
129. File path
130. File pipe
131. File Position
132. File puts
133. File pwd
134. File read
135. File read
136. File readable
137. File readable
138. File Readable
139. File Readable
140. File readable
141. File readline
142. File Readlines
143. File Readlines
144. File readlink
145. File real dir path
146. File realpath
147. File rename
148. File Seek
149. File setgrid
150. File setuit
151. File size
152. File size
153. File size
154. File socket
155. File split
156. File Stat
157. File stat
158. File Stat
159. File Stat
160. File Stat
161. File Stat
162. File Stat
163. File Stat
164. File Stat
165. File Stat
166. File Stat
167. File Stat
168. File Stat
169. File Stat
170. File Stat
171. File Stat
172. File Stat
173. File Stat
174. File Stat
175. File Stat
176. File Stat
177. File Stat
178. File Stat
179. File Stat
180. File Stat
181. File Stat
182. File Stat
183. File Stat
184. File Stat
185. File Stat Executable
186. File Stat Executable Real
187. File sticky
188. File symlink
189. File symlink
190. File Temporary File
191. File Test
192. File Test
193. File Test
194. File Test
195. File Test
196. File Test
197. File Test
198. File Test
199. File Test
200. File Test
201. File Test
202. File Test
203. File Test
204. File Test
205. File Test
206. File Test
207. File Test
208. File Test File setgrid
209. File Test File readable real
210. File Test File setuid
211. File Test File size
212. File Test File size
213. File Test File socket
214. File Test File sticky
215. File Test File symlink
216. File Test File world readable
217. File Test File world writable
218. File Tests
219. File Text File
220. File Time
221. File truncate
222. File truncate
223. File Type
224. File Type
225. File Type
226. File umask
227. File unlink
228. File Utilities
229. File utime
230. File Word Counter
231. File world readable
232. File world writable
233. File writable
234. File Writable File
235. File writable real
236. File Write MethodsFileFileFileFileFile
237. File zero
238. FileFile
239. FileFile
240. FileFile
241. Files and Directories
242. Files Indentical
243. Files Method Classes Comprehensive
244. Files Methods
245. FileStat
246. Flle Lock

GetByte
getc
gets

1. Heroku and Ruby PDF General introduction
2. Heroku and Ruby PDF General introduction
3. Heroku and Ruby PDF General introduction
4. Heroku and Ruby PDF General introduction
5. Heroku and Ruby PDF General introduction
6. Input Output
7. Input, Output, File, Directory Cleasses and Methods
8. Input Output Include Files
9. Input Output Read and Write Access Permisions and Files
10. Input Output Read and Write to Files Code Examples
11. Input Output Write Close
12. IO
13. IO
14. IO
15. IO
16. IO
17. IO
18. IO
19. IO
20. IO
21. IO
22. IO
23. IO
24. IO
25. IO
26. IO
27. IO
28. IO
29. IO
30. IO
31. IO
32. IO
33. IO
34. IO
35. IO
36. IO
37. IO
38. IO
39. IO
40. IO
41. IO
42. IO
43. IO
44. IO
45. IO
46. IO
47. IO
48. IO
49. IO
50. IO
51. IO
52. IO
53. IO
54. IO
55. IO
56. IO
57. IO
58. IO
59. IO
60. IO
61. IO
62. IO
63. IO
64. IO
65. IO
66. IO
67. IO
68. IO
69. IO
70. IO
71. IO
72. IO
73. IO
74. IO
75. IO
76. IO
77. IO
78. IO
79. IO
80. IO
81. IO
82. IO
83. IO
84. IO
85. IO
86. IO
87. IO
88. IO
89. IO
90. IO
91. IO
92. IO
93. IO
94. IO
95. IO
96. IO
97. IO
98. IO
99. IO
100. IO
101. IO
102. IO
103. IO
104. IO
105. IO
106. IO Directory Close
107. IO Directory Open File Directory
108. IO, File and Directories, Classes, Wikibooks
109. IO, File and Directory Classe, Methods and Properties Comprehensive
110. IO, File and Directory Methods Comprehensieve Listing of
111. IO File Directory
112. IO File Directory Closing
113. IO File Directory Closing
114. IO File Directory Closing
115. IO File Directory Closing
116. IO File Directory Closing
117. IO File Directory Closing
118. IO File Directory Closing
119. IO File Directory Flags
120. IO File Directory init
121. IO File Directory IO String
122. IO File Directory Messages
123. IO File Directory open
124. IO File Directory Pipes
125. IO File Directory Position
126. IO File Directory Reading
127. IO File Directory Streams
128. IO File Directory Writing
129. IO, Files, Directory
130. IO, Files, Directory ARGF
131. IO, Files, Directory ARGF
132. IO Flush
133. IOIO
134. IOIO

Joins strings to make a file name path
Last Changed Time of Directory Ctime
Methods of Ruby
More Files
Programming Ruby Book
Read
Readbyte
Reading And Writing Files
Reading Files
Readline
Readlines
Readpartial

1. Regular Expressions
2. Regular Expressions
3. Regular Expressions
4. Regular Expressions
5. Regular Expressions
6. Regular Expressions
7. Regular Expressions
8. Regular Expressions
9. Regular Expressions
10. Regular Expressions
11. Regular Expressions
12. Regular Expressions
13. Regular Expressions
14. Regular Expressions
15. Regular Expressions
16. Regular Expressions
17. Regular Expressions

Resources
Ruby and MySQL Tutorial
Ruby Core Library
Ruby VOIP SMS Code Development

1. Strings
2. Strings
3. Strings
4. Strings
5. Strings
6. Strings
7. Strings
8. Strings
9. Strings
10. Strings
11. Strings
12. Strings
13. Strings
14. Strings
15. Strings
16. Strings
17. Strings
18. Strings
19. Strings
20. Strings
21. Strings
22. Strings
23. Strings
24. Strings
25. Strings
26. Variables

Algebra ebook page-break formatted for digital television and pocket projector based classroom instruction

"Many elearning savvy  teachers and tutors know how easy it is to give a full screen 60 inch screen show with just a smart phone and pocket projector. However, they have problems finding algebra ebooks and algebra apps that have the content needed for their needs and formatted for use with pocket projectors and digital televisions ..... Mark Stansberry, Author, Very Best Algebra Notes, www.BookMarkTutoring.com

The latest ebook to hit the Amazon's Books is "The Very Best Algebra Notes." With its seemingly non-technology name, one would not suspect that it hits the mark as the ideal algebra elearning tool.

As an elearning tool, it goes several steps above your everyday algebra ebook or app. And its not because the technology it is based on isn't the same or very similar. The fact of the matter its because the way the ebook's been formatted and its content.  Unlike many algebra ebooks and apps, the content within it has  been formatted so that both the words, graphics and equations scale across different reading devices.

And according to Mark Stansberry, author of the Very Best Algebra Notes, devices scalability means a lot to not only the student but the teacher. "Before I decided on how the book should be laid out for the optimum  ebook and slide projector user experience, I examined the layout and formatting of the leading math etextbooks on  different devices. These included the iPhone, the Android, a number of tablets and the PC. What I found was that the equations and figures didn't scale with the words from device to device.  The most typical problem I came across was smartphone incompatibility. When the book was viewed on a smartphone, the graphics did not scale with the words. This  makes many algebra ebooks inefficient to use on smart phones and many smaller size tablets.

To overcome that problem, Mark decided to format the book in what he calls "pagebreak to pagebreak " formatting. With pagebreak to pagebreak formatting,  the books pages are  guaranteed not to be broken up across pages when a different device is used. "  Mark explains though that he used  "pagebreak-to-pagebreak" formatting only for the body of the book, the 48 Algebra slides. For the all text sections of the book, the table of contents, summary, and cross-linked index he used standard text-scaled formatting. Mark added that "when a text block does not contain graphics or equations, such as the table of contents or index, there is no need to use pagebreak-to-pagebreak formatting, in fact its counterproductive from a publication point of view. "

The end result was an algebra ebook that could not only be used to review algebra on smart phones and tablets, but one that is very easy to use with pocket projectors and televisions. With "pagebreak-to-pagebreak" landscape formatting and a smartphone with an HDMI port, teachers, students and tutors, can give full screen slide shows that are easy to navigate using their smart phone as a remote control device.

But that's not all that makes this algebra book so great for teachers, tutors and students as an elearning tool. The other side of the story is that the book was designed based on the Common Core State Standards for Algebra 1. This means that teachers and students that use it can be assured that the content covered matches the course material that the common core standards strongly recommend.  Which means that students finally have a resource that can be used effectively to score higher on Algebra exams that are given across high schools across the country. To date over 45 states have adopted the common core state standards.

Online drawing gadget used to teach fundamentals of 3D drawing

BookMarkTutoring.com's 3D gadget is used to give students a way to visualize linear perspective drawing concepts. The 3D topology grid, presented above, vanishes toward a central vanishing point. The 3D box becomes smaller as it heads to the back of the grid. When the box crosses the central vision line, one can see the right side of the box and then the left side of the box come into and out of view.

BookMarkTutoring.com(based in Santa Rosa), builds educational gadgets and games based on elearning technologies for in-person and online tutoring. Through BookMark's  tutoring services,  students learn how to draw and plan compositions based on BookMark's online drawing tools and simulations, in-person demonstrations and established drawing procedures.

Contact BookMark Tutoring
Email: mark.c.stansberry@gmail.com
Cell/Text: (707)235-4095
URL: www.bookmarktutoring.com

BookMark gives glimpse of SAT fashion cards, a fashionable and fun way to prepare for the SAT

Maria at Virtual Fashion Week modeling the
peasent look
Media: Pen and Ink

BookMark Tutoring (Santa Rosa, CA) has added SAT Fashion cards to its in-house line of educational tools. The new SAT Fashion cards  have been designed to make preparing for the SAT not only fun but fashionable.

The fashion illustrations on the cards along with the associated SAT study sentences put into context the meaning of the SAT vocabulary words.

The theme of the SAT fashion cards revolves around the latest fashion news: styles,  shows, business, designers and  model news.

SAT FASHION WORD OF THE DAY 

Opulent (adjective) wealthy

SAT Sentence:  Peasant outfits with an opulent look were designed for the virtual fashion show despite the objections of the model. 

About BookMarkTutoring.com

BookMarkTutoring.com provides personalized online and in-person lessons and tutoring for a wide range of subjects including mathematics, science and graphic design. Besides offering online tutoring services to the international community, BookMark provides its services specific to the needs of Santa Rosa Junior College students, Sonoma Stata Univeristy students and high schools throughout Sonoma county.

Specific subjects include algebra, geometry, calculus, statistics, macroeconomics as well as instruction for graphic design and the arts. These include comic drawing, fashion drawing, architectural drawing and Adobe tools lessons: Illustrator, Flash (ActionScript), DreamWeaver and PhotoShop.

Contact
Email: mark.c.stanseberry@gmail.com
Tel: (707)235-4095

URL: www.bookmarktutoring.com

BookMark distributes fashion coloring page through Mochimedia

BookMarkTutoring.com (Santa Rosa, CA) has released one of its swim suit designs as an online Click and Color coloring page through Mochimedia (San Francisco, CA), one of the largest distributors of online interactive games.

The actual coloring page is titled simply, High Fashion Swim Suit Coloring Page. However, the high end swim suit design is something you might expect to find in a model's swimwear collection rather than on an online coloring page.  It is a two and a half piece swim suit with a split front tied together with an array of colorful straps. The design has a over 10 straps that can be individually colored to match any type of virtual beach scene.  Altogether the swim suit coloring page has 19 color sectionals that permit the user to create a rainbow of different fashion color compositions.

According to BookmarkTutoring.com, the coloring page serves as not only an educational fashion color composition tool, but also provides a fun way to start to learn about actual graphic design tools like Adobe Illustrator and Photoshop.

Mark Stansberry, developer and designer of the High Fashion Swim Suit Coloring Page, said that the overall theme of BookMark's fashion coloring pages is educational, "BookMark's coloring pages and game designs introduce the player to the different graphic design functions that one is likely to find in  popular graphic design programs. Our user interfaces are however simpler and in many cases more efficient and user friendly."

About BookMarkTutoring.com

BookMarkTutoring.com provides  in-person and online lessons and tutoring for a wide range of subjects including mathematics, science and graphic design. Besides to the international online community, BookMark provides its services specific to Santa Rosa Junior College students, Sonoma Stata Univeristy students and high schools throughout Santa Rosa. Specific subjects include algebra, geometry, calculus, statistics, macroeconomics as well as instruction for graphic design and the arts. These include comic drawing, fashion drawing, architectural drawing and Adobe tools lessons: Illustrator, Flash (ActionScript), DreamWeaver and PhotoShop.

Contact
Email: mark.c.stanseberry@gmail.com
Tel: (707)235-4095