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ERIC Number: EJ930406
Record Type: Journal
Publication Date: 2010-May
Pages: 3
Abstractor: ERIC
ISSN: ISSN-0031-9120
Tiny Tool Converts Light to Electricity
Kamata, Masahiro; Tamamura, Yuna
Physics Education, v45 n3 p224-226 May 2010
In Japan, junior high school students learn about energy conversion between kinetic and potential energy. In addition, they learn about energy conversion among different kinds of energy, such as mechanical, electrical, thermal, light and chemical. As for the conversion between electrical and light energy, teachers usually use lamps or LEDs to explain the conversion from electricity to light, and use solar cells to explain the opposite conversion from light to electricity. Although it is a well known fact that LEDs can generate electricity when irradiated with intense light, the electric current obtained from one LED is very small. Thus, an LED is not very effective by itself when teaching about the energy conversion from light to electricity. However, by combining LEDs with a condenser, the authors developed a small gadget that generates electricity using two LEDs, stores it in a condenser and emits light from the same LEDs using the stored electricity. Because their students consider it to be picking up light, storing it and releasing it, the tool is called the PSR. This article discusses the structure of the PSR and describes how to use the tool. By focusing on the colours of the LEDs and the light source, the tool could be used to demonstrate the relationship between energy and the wavelength of light. (Contains 7 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Junior High Schools
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Japan