If you like us, please share us on social media.
The latest UCD Hyperlibrary newsletter is now complete, check it out.

GeoWiki.png
ChemWiki: The Dynamic Chemistry E-textbook > Development Details > Approaches > Demos > Additional Demos > The Fruit Powered Clock

MindTouch
Copyright (c) 2006-2014 MindTouch Inc.
http://mindtouch.com

This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).

At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.

A complete copy of the MSA is available at http://www.mindtouch.com/msa

The Fruit Powered Clock

 

Chemical Concept Demonstrated

  • Electrochemical cells

Demonstration

  • A zinc probe has been soldered to one of the leads from a digital clock; a copper probe has been soldered to the other.
  • The probes are inserted into a fruit or vegetable.
  • A jumper wire that is soldered to pieces of zinc and copper metal is then inserted so that the zinc end is next to the copper probe and the copper end next to the zinc probe.
clock.gif

Observations

The clock turns on.  The clock can run for up to a week.

Explanation (including chemical equations)

Because the digital clock requires a potential of at least 1.2 V, the pair of zinc-copper cells must be connected in series.  A zinc probe has been soldered to one of the leads from the digital clock and a copper probe has been soldered to the other lead.  These probes are inserted into the fruit or vegetable of choice roughly 1.5 inches apart.  A jumper wire that is soldered to pieces of zinc and copper metal is then inserted into the fruit or vegetable so that the zinc end of the jumper wire is 1/4 inch from the copper probe from the clock and the copper end of the jumper wire is a similar distance from the zinc probe from the clock.

The resulting zinc-copper cell can be inserted into a variety of fruits and vegetables to determine the presence of electrolytes.

Contributors

 

You must to post a comment.
Last Modified
10:30, 2 Oct 2013

Tags

Classifications

(not set)
(not set)

Creative Commons License Unless otherwise noted, content in the UC Davis ChemWiki is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. Permissions beyond the scope of this license may be available at copyright@ucdavis.edu. Questions and concerns can be directed toward Prof. Delmar Larsen (dlarsen@ucdavis.edu), Founder and Director. Terms of Use