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)