A coil of wire is connected in
series with
a power supply and light bulb. The power supply voltage is set to
about 8 V so that the bulb barely lights. When
the coil of wire is
immersed in liquid nitrogen, the resistance of the wire drops from 150
Ω to 60 Ω
and the bulb becomes much brighter.
NOTES
Use video camera to show bulb or else
turn
out the lights so the dim bulb is visible.
