Junior High School Science Class Using Hand-drawn Registers and a Simple Tester

Abstract

A thick line drawn on a sheet of paper with a pencil is electrically conductive and its resistance can be roughly estimated using a simple tester made of a light-emitting diode and lithium coin-type cells. They were used in a junior high school science class, and it was made clear that our experiment can be used when students learn how the shape of a resistor affects the value of resistance and the electric current passing through it.