electric messages: then and now
DESCRIPTION
Electric Messages: Then and Now. What will we do today?. Send a message - using yesterday’s technology Send a message - using today’s technology. Why is this experiment useful to teachers and students?. As a result of this activity, students should develop an understanding of - PowerPoint PPT PresentationTRANSCRIPT
Electric Messages: Then and Now
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What will we do today?
Send a message - using yesterday’s technology
Send a message- using today’s technology
Why is this experiment useful to
teachers and students?As a result of this activity, students should
develop an understanding of electrical communicationsaudio and visual applications of International Morse Codeelectrical wiring, simple switchesteamwork
3
Activity Objectives
Learn about electrical based communications.Learn about the Morse Code system.Learn about wiring, switches, and simple circuits.Learn about teamwork and problem solving. Learn about the history of communication and its impact on world events.
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Align the project to the curriculum framework or standards
This should be the first thing you do together with the educator Consult education standards and get help from education department to align activity with– Science standards– Math standards– Technology standards
History of Telegraphy
Ancient: Optical: Smoke signals – 1800: Optical: Semaphore1832: Signal over Electrical Wires 1837: Morse Code: Morse & Vale1891: World-wide cables1896: Radio telegraph: Marconi over 6 km Codes, modulation, multiplexing1910: Printing telegraph1920: Telex network1970: Internet - Email1991: World-wide web
The TitanicThe “unsinkable” ship set sail in 1912They received warning messages from the steamship Mesaba reporting a large number of icebergsThe Titanic hit an iceberg and began to sinkInitial signal distress signal code CQD“Send SOS, it’s the new call”Help was very near, but Call for help was not received by the Californian, only 10 km away
04/22/238
Letter Code Letter Code Letter Code Number Code Symbols Code
A ·- N -· ä ·-·- 0 ----- Period [.] ·-·-·-
B -··· O --- à ·--·- 1 ·---- Comma [,] --··--
C -·-· P ·--· ĉ -·-·· 2 ··--- Question mark [?] ··--··
D -·· Q --·- ch ---- 3 ···-- Apostrophe ['] ·----·
E · R ·-· ð ··--· 4 ····- Exclamation [!] -·-·--
F ··-· S ··· è ·-··- 5 ····· Slash [/ ] -··-·
G --· T - é ··-·· 6 -···· Ampersand [&] · ···
H ···· U ··- ĝ --·-· 7 --··· Colon [:] ---···
I ·· V ···- ĥ -·--· 8 ---·· Semicolon [;] -·-·-·
J ·--- W ·-- ĵ ·---· 9 ----· Hyphen [-] -····-
K -·- X -··- ñ --·-- At sign [@] ·--·-·
L ·-·· Y -·-- ö ---· Underscore [_ ] ··-- ·-
M -- Z --·· ü ··--
Your Challenge
Build a device to send a message - using yesterday’s technology
Send a message- using today’s technology
Materials
Aluminum Foil Battery Binder Clips Brass Brads/FastenersBulb Cardboard Wire (insulated)
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The Task (1)
1. Build a device that uses Morse Code
1. Test the device by sending the messageSOS – Save our Souls
The Task (2)1. Participant A:
-Think of an emergency situation, then send a message explaining the situation and ask for help. Keep it secret
2. Participant B:-Once B understands the message report group and time taken on the flip chart – time from A starting to transmit to B understanding the message
RULE No speaking, but B may nod after each letter or word. Once B thinks he understands the message he must tell A what he understands
The Task (3)
1. Repeat the task reversing roles, but message must be different
2. Record time taken on Flip Chart
The Task (4)
1. Repeat the task using a mobile phone message can be the same
2. Record time taken on Flip Chart
Summarising1. A sends message to B using Morse Code2. B sends message to A using Morse Code3. A sends message to B text on Mobile phone
RULESNo speaking, but B may nod after each letter or
word. Once B thinks he understands the message he must tell A what he understands
Record time from start of transmission to understanding the message
Messages
Give examples of messages that are sent in everyday life today.Explain and discuss– Importance– Reasons for secrecy and security– How is security achieved?– Accuracy requirements.
How do today’s messages differ from yesterday’s messages?– Technology used– Social requirements– Spam and advertising
Reflection Questions
What was one thing you liked about this lesson plan? What is its main weakness if any?What should be included to bring in technology used in our modern society?How would you modify the instructions to improve the experience of participants?How would you use it in the classroom?