Answer to Question 3

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(a) Power = intensity area = 500 W m-2 25 10-4 m2 =  1.25 W  (Did you remember to convert cm2 to m2)

(b) Real power = (10 100) 1.25 W = 0.125 W

(c) Current (A) = 0.125 W 1.2 V = 0.104 A ( = 104 mA)

(d) Charge time = 600 mAh 104 mA = 5.8 h