power
That is called power. In SI units, it is measured in Joules / second, which is called Watts.
= voltage
Work per unit time is more correctly described as power. It's unit is the watt (W). The watt is a derived unit in the SI system from the following base SI units: 1 Watt = 1 Joule per second 1 Watt =...
Speed. If you want a vector (i.e., direction is relevant), velocity.