Variable Speed: Most powertools will offer this feature.  Variable Speed allows you to adjust the suit of the speed, usually by a dial, to suit the task at hand. (Usually found in Jigsaws, some angle grinders etc)

Volt/Amps:
Amps is the term used to describe the flow of current.  Volts are the electrical pressure applied to a circuit to make the current flow.  The formula for power or watts is Volts x Amps.  Volt Amps would be Watts.

Voltage:
The electrical potential difference measured between two conductors such as the “hot” and “neutral” for AC power supply or the potential difference between the + and the – poles of the DC supply. 

Volts:
A unit that measures the amount of electrical pressure. E = IR

 

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