- on Education & Information
- Published in issue 7/2008 on page 27
Mysterious Self Charging
Here we take a light-hearted, exploring yet purposely unscientific look at one of the fundamental effects of physics, namely contact voltage. When two dissimilar materials come into contact an exchange of (negatively charged) electrons occurs so that the donor material losing electrons takes on a net positive charge while the material receiving electrons takes on a negative charge, the overall effect giving rise to a contact potential.