What kind of work does the fan do in 10 minutes if its power is 30 watts?

We express the fan power by the formula:
N = A / t, where N is the fan power (N = 30 W), A is the value of the mechanical operation of the fan (J), t is the fan operation time (t = 10 min = 10 * 60 = 600 s).
Let us express and calculate the mechanical work:
A = N * t = 30 * 600 = 18000 J = 18 * 10 ^ 3 J = 18 kJ.
Answer: The mechanical work of the fan is 18 kJ.