Power (Physics)

From Conservapedia
This is the current revision of Power (Physics) as edited by DavidB4-bot (Talk | contribs) at 10:42, 29 June 2016. This URL is a permanent link to this version of this page.

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

In physics, power refers to the rate of transfer of energy respect to time.[1]

Mathematically, average power is expressed as:

P = W / Δt

Therefore, power at any instant can be determined by the equation:

P = limΔt->0 W / Δt = dW / dt

Since dW = F dx and v = dx / dt follows that:

P = F · dx / dt = F · v

The usual units for power are Watts ( W = J/s ) and horsepower ( hp = 746 W )

References

  1. Serway and Beichner, Physics For Scientists and Engineers, Fifth Edition