flucas/Fotolia
The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and Highers/Advanced Highers exam specifications.
The performance of light bulbs can be described in terms of their efficacy, which is similar to efficiency, and their Kelvin rating, which is related to temperature. The illuminance at a given distance from a light source obeys an inverse-square law.
Your organisation does not have access to this article.
Sign up today to give your students the edge they need to achieve their best grades with subject expertise
Subscribe
