power physics Summary

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power physics Summary

  • Definition
    • Power is the rate at which work is done (or the rate at which energy is consumed).
      non-calculuscalculus
      P =ΔW
      Δt
      P =dW
      dt

      Where

      P =power
      W =work
      t =time
    • Power is the scalar product of force and velocity
      simplifiednon-calculuscalculus
      P = FvP = Fv cos θP = F · v

      Where

      P =power
      F =component of force parallel to direction of motion
      F =magnitude of force
      F =force vector
      v =magnitude of velocity
      v =velocity vector
      θ =angle between force and velocity
  • Units
    • The SI unit of power is the watt, named after the Scottish engineer James Watt (1736–1819).

      [W = J/s = kg m2/s3]

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