Contrary to a common misconception, physics is not best measured by the memorization of lots of formulae. A small number of simple ideas, applied correctly, can describe a remarkable amount of the ...

Average power is defined as work over time, and it's measured in Watts, which is just another way of saying Joules per second. Basically, it's used to measure how much energy is converted from one ...

Laser power also can be measured by comparison to a reference mass, which is what scales measure, or an equivalent force. This idea is almost as old as the laser but only recently became practical.