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Speed and Power tests represent different styles of test, rather than measuring different aptitudes or abilities; specifically, they describe the nature of the test questions themselves.

In a speed test, the items tend to be quite small in scope, very specific and often not too difficult. With speed tests it is how many questions the test taker can answer correctly that is important. A numerical aptitude test with speed items could look something like this; you can see how each question is very narrowly confined in terms of content:

123 + 456 = ?

987 – 654 = ?

567 × 123 = ?

In the case of a power test, the approach is quite different and much more emphasis is placed on presenting the test taker with a smaller number of more difficult or complex questions.

A numerical aptitude test with power items may look something like:

Brian is 6 cm taller than Kate and Kate is 2 cm taller than William. William is 1,680 cm tall. Andrew is taller than all three but not as tall as Marjorie.

Brian is taller than Andrew

a) true

b) false

c) can’t tell

Brian is 1,692 cm tall

a) true

b) false

c) can’t tell

Typically, speed tests contain a lot more items than power tests although they often have the same approximate time limit. Power tests tend to be used more at the graduate, professional or managerial level since their expanded format allows for more work-related content to be addressed.