Answer to Question 2

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Current (A) = capacity (Ah) time (h)

(a) 40 min = 2/3 h

     Current = 2.0 Ah 2/3 h = 3.0 A

(b) Power (W) = voltage (V) current (A) = 18.0 3.0 = 54 W

(c) It would be adequate for very light work.  A mains powered machine has a power of about 400 W