Answer to Question 3

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 V = 16 sin (50 p 25 10-3) = -11.3 V

 I = 2 sin (50 p 25 10-3) = -1.41 A

 Power = -11.3 -1.41 = 16 W

 Each cycle lasts 40 ms. 

The current and voltage are becoming more negative.

The power is increasing.