https://physlab-wiki.com/ 2026-04-23T05:12:55+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2021-09-15T16:55:33+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/resistance/jacobs_ladder?rev=1631739333&do=diff Jacob's Ladder A high-voltage transformer is used to create an electrical arc between two vertical conductors. As the hot, ionized gas created by the arc rises, so does the arc. J4 PIRA DCS 5D40.10 text/html 2022-02-17T14:39:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/resistance/joule-heating?rev=1645126775&do=diff Joule Heating [ Wire is taut when no current is sent through it.] [ Wire glows red hot and softens when a large current is sent through it.] Description A large current is sent through a wire held taut between two insulated rods with leads on them. This will cause the wire to heat up until it glows red hot and goes slack as the metal approaches its melting point. A small mass can be hung from the center of the wire to accentuate the softening of the metal and even cause it to break. Flash pap… text/html 2021-09-15T16:48:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/resistance/resistance_of_wire_at_low_temperature?rev=1631738894&do=diff Resistance of Wire at Low Temperature A light bulb is powered in series with a coil of thin copper wire. Initially the coil is at room temperature and, because of its resistance, the bulb is only faintly lit. When the coil is immersed in liquid nitrogen, its resistance is quickly and substantially reduced causing the bulb to glow very brightly. text/html 2021-09-15T16:50:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/resistance/resistor_show_and_tell?rev=1631739058&do=diff Resistor Show and Tell A variety of resistor types, shapes, and sizes is shown to the class for discussion. J4 PIRA DCS 5D10.10