The power

In general, in Physics, puterus is a scalar physical quantity that shows how fast energy is transmitted from one physical system to another.

In Mechanics power shows how fast mechanical work is done in a mechanical action:

$$P=\frac{L}{\mathrm{\Delta }t}$$

(1)

 

$\mathrm{\Delta }t$  being the time interval in which a mechanical work was performed L. The unit of measurement of power in the international system is:

${⟨P⟩}_{\mathit{SI}}=1\frac{J}{s}=1W$  (Watt, from James Watt)

Example: To lift a package with mass m=10kg to a height h=1m, a mechanical work L=100J must be performed. To be able to do this action in a second ( $\mathrm{\Delta }t=1s$ ), a power P=100W is required. If the available power is only 10W, this action can only be done in 10s.

Another unit of power measurement is 1HP (horsepower): 1HP=736W

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