R13e(Hand-drawn resistors)
Hand-drawn resistors and a simple tester that uses a light-emitting diode
PURPOSE:
This resistor and tester are easy to make. It helps students to understand about combined resistance.
TARGET:
Junior high school students
CATEGORY:
Physics, Monozukuri (Science Craft)
MATERIAL:
[Hand drawn resistors]
thick paper
pencil (6B)
[Testers]
aluminum tape
lithium battery cell (CR2032)
red LED (OptoSupply OSHR5111A)
aluminum tape
bulldog clips (plastic)
kent paper
USAGE:
The effect of resistance can be seen as the light level of LED.
Several patterns can be written on the paper using 6B pencil. (cf.Fig.1,2)
Compare the resistance by using the tester.
When long lines and thin lines are written, LED will be darker.
Thick lines and short lines make LED light brighter.
Also, several lines make LED brighter.
RESULTS:
Typical results are presented in Fig.3.
REFERENCES
Masahiro Kamata and Mayumi Abe, "Hand-drawn resistors and a simple tester using a light-emitting diode", Phys. Educ., 47, 741 (2012)