Tsokos, K. A. (First edition 1998, Fourth edition 2005). Physics for the IB Diploma (fourth edition)(en inglés). Cambridge University Press. pp. 3, 109. ISBN978-052160405-5. «Power is the rate at which work is being performed. When a quantity of work ΔW is performed within a time interval Δt the ratio P = ΔW/Δt is called the power developed. Its unit is joules per second and this is given the name watt (W): 1 W = 1 J/s».
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Fowle, Frederick E., ed. (1921). Smithsonian Physical Tables (7th revised edición). Washington, D.C.: Smithsonian Institution. OCLC1142734534. Archivado desde el original el 23 de abril de 2020. «Power or Activity is the time rate of doing work, or if W represents work and P power, P = dw/dt. (p. xxviii) ... ACTIVITY. Power or rate of doing work; unit, the watt. (p. 435)».
Heron, C. A. (1906). «Electrical Calculations for Rallway Motors». Purdue Eng. Rev. (2): 77-93. Archivado desde el original el 23 de abril de 2020. Consultado el 23 de abril de 2020. «The activity of a motor is the work done per second, ... Where the joule is employed as the unit of work, the international unit of activity is the joule-per-second, or, as it is commonly called, the watt. (p. 78)».
Fowle, Frederick E., ed. (1921). Smithsonian Physical Tables (7th revised edición). Washington, D.C.: Smithsonian Institution. OCLC1142734534. Archivado desde el original el 23 de abril de 2020. «Power or Activity is the time rate of doing work, or if W represents work and P power, P = dw/dt. (p. xxviii) ... ACTIVITY. Power or rate of doing work; unit, the watt. (p. 435)».
Heron, C. A. (1906). «Electrical Calculations for Rallway Motors». Purdue Eng. Rev. (2): 77-93. Archivado desde el original el 23 de abril de 2020. Consultado el 23 de abril de 2020. «The activity of a motor is the work done per second, ... Where the joule is employed as the unit of work, the international unit of activity is the joule-per-second, or, as it is commonly called, the watt. (p. 78)».
worldcat.org
Fowle, Frederick E., ed. (1921). Smithsonian Physical Tables (7th revised edición). Washington, D.C.: Smithsonian Institution. OCLC1142734534. Archivado desde el original el 23 de abril de 2020. «Power or Activity is the time rate of doing work, or if W represents work and P power, P = dw/dt. (p. xxviii) ... ACTIVITY. Power or rate of doing work; unit, the watt. (p. 435)».
