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Given:

P = power.
T = torque. n = RPM.

The correct relationship is…

  • A
    P = T / n.
  • B
    P = T x n.
  • C
    P = T x GS.
  • D
    P = T x TAS.

Power is work done per unit of time. Work is generated when a force is applied to an object and moves it over a certain distance. It is measured in Joules, and 1 Joule = 1 Nm (same unit as torque). The Rotations Per Minute (rpm) define an angular motion over time. Therefore, the product of work generated by a body (Nm) in angular motion over time gives you the power produced by that body.

Try to remember the correct formula by using the units of each variable.
P = T x n

Where:
T – torque in Nm
N – rotations per minute (1/min)
P – Power in Watt (W)

Since 1 W = 1 Nm/s, a small conversion needs to be made from rpm (1/min) to rps (1/sec) by using:
rpm ÷ 60 = rps

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