1 / 12

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:.

yagil
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related