I'm guessing you're quite unfamiliar with the metric system. The different types of measurements are defined in relation to one another and are thus easy to fig

I'm guessing you're quite unfamiliar with the metric system. The different types of measurements are defined in relation to one another and are thus easy to figure out, unlike the imperial system where everything is odds and ends. A kilogram is (almost exactly, but slightly different) to the mass of one litre of water. The force required to accelerate this mass at one metre per second squared is one Newton. One Newton acting on one square metre is one Pascal of pressure. Applying a force of one Newton through a distance of one metre is one joule of energy. This is the same amount of energy in passing a one ampere current of electricity through a resistance of one ohm for one second. One joule per second is one Watt.