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Voltage

What is Voltage?

Paul Evans - Mar 15, 2015 7

What is electricity?

Paul Evans - Mar 3, 2015 7

Mass and weight

The difference between mass and weight

Paul Evans - Feb 20, 2015 2

Area of an annulus or pipe

Area of an annulus

Paul Evans - Feb 14, 2015 1

Area of a circle

Paul Evans - Feb 14, 2015 5

Area of a square

Paul Evans - Feb 14, 2015 0

Area of a rectangle

Paul Evans - Feb 14, 2015 0

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