Technical term in physics for the rate of doing work; equivalent to power in English.
Power is defined as the amount of work per unit time.
The power of this machine is 100 watts.
仕事 means work (physics), while 仕事率 is the rate of doing work, i.e., power.
Compound of 仕事 (work) and 率 (rate), a direct translation of the physics concept of power.