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Sending an Electrical Signal Over a Telegraph

CSEF · 2005 Electricity & Electronics

Ryan T. Bridge · Dry Creek School, Clovis

Overview

Objectives/Goals My objective was to see if I could use one "D" battery and send a clear signal over 25 feet. I beleive I can send a signal over 25 feet. Methods/Materials A simple telegraph made of an electromagnet, a key, a sounder, wire, and batteries. I used from one to four "D" batteries and tested them over a 1 to 135 foot wire. Results The 4 "D" batteries could send a good strong signal 125 feet while the 1 "D" battery went only 2 feet. Conclusions/Discussion My conclusion is that the longer the leanth of wire the more power (bateries) that is needed to send a good electracal signal over a telegraph.

Summary statement

How far you can send a good clear signal over a telegraph with one "D" size batery.

Help received

Dad helped build telegraph and type my report.

Competition history

  • CSEF 2005 Electricity & Electronics · Entry J0705

Resources

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