An experiment can never produce a "perfect" result, but is always subject to certain uncertainties. This will be explained mathematically and demonstrated practically through experimentation. The significance for the interpretation of a result will be shown, from which the importance of constant experimental conditions in physics will be concluded.

 Subject: Physics, Mathematics
 Years 7-8: M7.1.1, M7.3, M7.4 (Min-Max method for determining errors)
 Years 11-12: M11.4 (Gaussian error propagation and linearization)
 Duration: 3 x 90 minutes

 "The experiment is the ultimate judge of scientific 'truth'" - Feynman.

 Providing the mean value of an experimental result without the corresponding error bars is meaningless.

 How do you determine and interpret measurement uncertainties for meaningful physical experiments?

 This learning unit deals with this question.

 - Fundamentals of measurement uncertainty – Learn about the different types of uncertainties and develop an intuitive understanding of measurement errors.
 - How to measure correctly with a multimeter? How to account for uncertainties in the measurement.
 - Learn to master simple and practical rules for calculating measurement uncertainty
 - The PV experiment 4.3 (PV efficiency) of Solar Bildung is carried out and the influence of temperature on the output power of a PV module is analyzed, taking into account the measurement uncertainties.

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