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A control variable is one that must be kept constant for a fair test.

Control Variables. A control variable is one that must be kept constant for a fair test. You must make sure that you keep control variables constant throughout your experiment to ensure that you are carrying out a fair test. Example:.

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A control variable is one that must be kept constant for a fair test.

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  1. Control Variables A control variable is one that must be kept constant for a fair test. You must make sure that you keep control variables constant throughout your experiment to ensure that you are carrying out a fair test. Example: When investigating the effect of the number of batteries on the current in a circuit, the control variables would be: • Size of the batteries • Thickness and type of the wire • Length of wire • Number and type of components in the circuit

  2. Categoric Variables

  3. brown green blue eyes. Categoric Variables Categoric variables are classes, names, labels or categories, e.g... • Colour of eyes, e.g. brown, green, blue • Months of the year, e.g. Jan, Feb, Mar... • Makes of cars, e.g. Ford, Vauxhall, Mercedes • States of matter, e.g. solid, liquid or gas • Exam results, e.g. pass or fail • Preferences, e.g. like or dislike

  4. Discrete Variables Discrete variables can only have whole numbers. Example: • The number of peas in a pod • The number of cells in an electric circuit • The number of coils of wire in an electric motor • The number of dandelions in a square metre • The number of layers of insulation

  5. Ordered Variables

  6. Ordered Variables Ordered variables have a natural order to them, They can be used to describe objects, people, happenings and scientific events. • Taller, Shorter • Low, Middle, High • Large, Medium, Small • Cooler, Warmer Ordered variables are not precise - if possible, use continuous variables in scientific work.

  7. Continuous Variables

  8. Continuous Variables Continuous variables are measured and can have a decimal point. Example: • If we measure height, the reading could be 1.56m, 1.562m, or 1.5623m, etc. • The current or voltage in a circuit • The mass of salt dissolved • The time taken to travel 1 metre • The length of a leaf

  9. Identifying Variables Answer the following questions on types of variables...

  10. Which Type of Variable? Drag these variables to the correct box...

  11. Types of Variable - Summary Point the cursor to review these types of variable...

  12. End of Show

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