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Work and the potential to do work, energy, are based on the product of force times displacement, the units being Newton times meter (Nm or Joule). When work is expressed per unit time it is called power (Nm/s or Watt). Linearity of the relations between force and displacement (velocity) or, equivalently between pressure and volume is not required in the calculation of work and power, while it is required in the calculation of resistance and impedance.
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Westerhof, N., Stergiopulos, N., Noble, M.I.M. (2010). Cardiac Work, Energy and Power. In: Snapshots of Hemodynamics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-6363-5_15
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DOI: https://doi.org/10.1007/978-1-4419-6363-5_15
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