Uploaded November 2023 | Updated September 2026, 19 minutes ago
For thousands of questions and detailed answers, check out our GCSE workbooks amazon.co.uk/Dr-Shaun-Donnelly/e/B084FH9JPF?ref_=dbs_p_pbk_r00_abau_000000&_encoding=UTF8&tag=freesciencele-21&linkCode=ur2&linkId=1fbc0f5c3e7450e895637b56ee343168&camp=1634&creative=6738
Great deals on workbooks for schools freesciencelessons.co.uk/school-licences
In this video, we look at random errors. First we explore what is meant by random errors and look at examples of how they occur, including parallax error. We then explore how we can reduce the effects of random errors.
This video is based on the AQA GCSE specification. If you are following a different exam board, then I recommend that you check your specification.
Image Credits
Thermometer
commons.wikimedia.org/wiki/File:Laboratory_thermometer-03.jpg
Lilly_M, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Stopclock
commons.wikimedia.org/wiki/File:Stoppuhr_digital_noBG.jpg
commons.wikimedia.org/wiki/User:Lesselich, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Magnesium reacting with acid
commons.wikimedia.org/wiki/File:HCl_%26_magnesium.jpg
Dr.T, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Digital thermometer
commons.wikimedia.org/wiki/File:2023_Termometr_kuchenny.jpg
Jacek Halicki, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
For thousands of questions and detailed answers, check out our GCSE workbooks amazon.co.uk/Dr-Shaun-Donnelly/e/B084FH9JPF?ref_=dbs_p_pbk_r00_abau_000000&_encoding=UTF8&tag=freesciencele-21&linkCode=ur2&linkId=1fbc0f5c3e7450e895637b56ee343168&camp=1634&creative=6738
Great deals on workbooks for schools freesciencelessons.co.uk/school-licences
In this video, we look at random errors. First we explore what is meant by random errors and look at examples of how they occur, including parallax error. We then explore how we can reduce the effects of random errors.
This video is based on the AQA GCSE specification. If you are following a different exam board, then I recommend that you check your specification.
Image Credits
Thermometer
commons.wikimedia.org/wiki/File:Laboratory_thermometer-03.jpg
Lilly_M, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Stopclock
commons.wikimedia.org/wiki/File:Stoppuhr_digital_noBG.jpg
commons.wikimedia.org/wiki/User:Lesselich, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Magnesium reacting with acid
commons.wikimedia.org/wiki/File:HCl_%26_magnesium.jpg
Dr.T, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Digital thermometer
commons.wikimedia.org/wiki/File:2023_Termometr_kuchenny.jpg
Jacek Halicki, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons










![A Level Biology Revision (Year 13) Excretion and Waste Products
In this video, we look at excretion and waste products. First we look at the definition of excretion. We then look at the waste products carbon dioxide, nitrogenous waste products including urea and bile pigments.
Image credits:
Tiger
https://commons.wikimedia.org/wiki/File:Siberischer_tiger_de.jpg
S. Taheri, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons
Fish
https://commons.wikimedia.org/wiki/File:Vieja_melanura Karlsruhe_Zoo_01.jpg
H. Zell, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Bird
https://commons.wikimedia.org/wiki/File:Female_house_sparrow_at_Kodai.jpg
Deepak Sundar, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Insect
https://commons.wikimedia.org/wiki/File:Sympetrum_sanguineum_qtl13.jpg
Quartl, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Red blood cells
https://commons.wikimedia.org/wiki/File:Blood-rbcs_and_thrombocytes2.jpg
Echinaceapallida, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Liver animation
https://commons.wikimedia.org/wiki/File:Liver_01_animation2.gif
Polygon data is generated by Database Center for Life Science(DBCLS)[2], CC BY-SA 2.1 JP https://creativecommons.org/licenses/by-sa/2.1/jp/deed.en, via Wikimedia Commons A Level Biology Revision (Year 13) Excretion and Waste Products](https://i.ytimg.com/vi/iYtgn7dwGW0/mqdefault.jpg)