Changes

File:Resistivity geometry.png|A piece of resistive material with electrical contacts on both ends

File:Resistivity geometry.png|A piece of resistive material with electrical contacts on both ends

File:Newtons cradle animation.ogv|An animation of [[Newton's cradle]]. Like the balls in Newton's cradle, electrons in a metal quickly transfer energy from one terminal to another, despite their own negligible movement.

File:Newtons cradle animation.webm|An animation of [[Newton's cradle]]. Like the balls in Newton's cradle, electrons in a metal quickly transfer energy from one terminal to another, despite their own negligible movement.

File:Superconductivity 1911.gif|Original data from the 1911 experiment by [[Heike Kamerlingh Onnes]] showing the resistance of a mercury wire as a function of temperature. The abrupt drop in resistance is the superconducting transition.

File:Superconductivity 1911.gif|Original data from the 1911 experiment by [[Heike Kamerlingh Onnes]] showing the resistance of a mercury wire as a function of temperature. The abrupt drop in resistance is the superconducting transition.