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#### Uncertainty

The error in measured values.

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### 1. Accuracy, Precision, Error and Uncertainty

This video introduces some of the essential terminology you need to understand as you complete practical work at A level for Physics, Biology and Chemistry. This is essential if you are working towards the Practical Endorsement and for your end of year exams where you are assessed on your knowledge of the scientific method.

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### 2. Absolute Uncertainty

This video looks at 'Absolute Uncertainty' which is really important as you complete practical work at A Level for Physics, Biology and Chemistry.

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### 3. Percentage Uncertainty in Single Measurements

Percentage uncertainties for single measurements can be calculated using the equation in this video.

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### 4. Percentage Uncertainty in Multiple Measurements

When you take repeated measurements you need to work out the percentage uncertainty in a different way. The range of the results in now important - the greater the spread of results the less certain you are with your final value.

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### 6. Combining Uncertainties

You can calculate the percentage uncertainty in the various measured values when you complete practical work for A Level Physics. Combining uncertainties needs extra care.

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### 7. Combining Uncertainties Example

This is a worked example on combining uncertainties for A Level Physics. I record some data, calculate the various percentage uncertainties, then combine these and show you how to find the total uncertainty in the volume of a rod.

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