EM8.4 Resistance Dependence on Temperature
A power transformer is attached to one end of the exposed wire. The other is connected to the big demonstration meter, and that is finally attached to the transformer. Turn the power on and let the class see the current through the wire. Place the fan new the wire and turn it on. As the wire cools, the current increases.
Be careful not to put too much current through the coil as to not melt the coil or its plexiglass holder, for that will result in a rather unpleasant odor for the remainder of the class.
Equipment Location: D45, D56, E41, H34