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Hi Peter and Max,

Use Zinc and Copper.These are easy to get (McMaster-Carr Supply Co has the : Part No. 8963K36is a 12 inch square sheet of .032 inch thick sheet) You should be able to get the zinc through them if you ask or go through a chemical supply house.

This should work very well with lemons

John Bowditch
Ann Arbor Hands-On Museum

> ----------
> From:         Max Scharfenberger
> Reply To:     Informal Science Education Network
> Sent:         Thursday, April 8, 2004 10:51 AM
> To:   [log in to unmask]
> Subject:      Re: fruit batteries
> 
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> Hi Peter:
> 
> I am not sure what you are using for electrodes, but if you want to get a
> potential difference of 1.5 Volts my suggestion is to use a strip of
> Magnesium and a strip of Copper.  We have done this experiment in the past
> and have even hooked it up to a simple clock and let it run for a full day
> as part of one of our camps.  I would suggest not using paperclips since
> these are not a pure enough source of the metals that you need.
> 
> Max Scharfenberger
> VP Programs
> Odyssium
> 11211 142 Street
> Edmonton, AB  T5M 4A1
> phone: 780-452-9100
> fax: 780-455-5882
> [log in to unmask]
> 
> 
> -----Original Message-----
> From: Pete Wheeler [mailto:[log in to unmask]]
> Sent: Thursday, April 08, 2004 12:40 AM
> To: [log in to unmask]
> Subject: fruit batteries
> 
> 
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> ****************************************************************************
> *
> 
> I have been trying to put together an electronics dem using lemons,
> copper nails and steel paperclips as a power source, from websites I
> learnt you should be able to generate about half a volt per lemon, I had
> no luck trying to power a 1.5v light bulb with one, two, three or four
> lemons in series, can anyone help, has any one actually physically ever
> made this or similar dems work. Thanks
> 
> Pete
> 
> Pete Wheeler
> Kids' Science State Project Officer
> Scitech Discovery Centre
> 
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