These resources have been reviewed and selected by STEM Learning’s team of education specialists for factual accuracy and relevance to teaching STEM subjects in UK schools.

Candle power

The video and worksheet sets out a measurement challenge for students that can be carried out either at home or school. They must use some scales to measure the starting mass of a tealight candle then burn it for two hours before measuring the final mass. They use a formula on the worksheet to calculate the candle power in Watts. They are encourage to take multiple readings and submit them to the NPL website, via a link in the worksheet. This resource could be used to investigate the power of candles made from different types of wax too.

The report file looks at measurements collected by NPL and draws some conclusions.

Show health and safety information

Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.

Information on the permitted use of this resource is covered by the Category Three Content section in STEM Learning’s Terms and conditions.