Simple Circuit Modules.These modules may be used to construct simple circuits of the type normally implemented on for example a Worcester Circuit Board. They are intended to introduce younger pupils (ages 11-13) to some of the more familiar applications of devices and circuits the main emphasis being on simple electrical circuit work.The module is 80 x 60mm and has 4mm plug connections.This module is a thermistor unit with a cluster of 5 VA1108s in parallel. The resistance is approximately 200 Ohm at 90°C.