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Per11_exercise

Per11_exercise - Solutions to Period 11 Exercises E.1 On a...

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Solutions to Period 11 Exercises E.1 On a cold morning your car starter motor cranks for 10 seconds, drawing 60 amps (= 60 coul/sec) of current from your 12 volt battery. How much charge (in coul) flowed through the starter motor? a) 6 coul b) 10 coul c) 120 coul d) 600 coul Solve I = Q/t for Q: Q = I t = 60 amps x 10 sec = 60 coul x 10 sec = 600 coul sec E.1 = d E.2 How much electric power (in watts) was drawn by the starter motor in the previous question? a) 1.2 watts b) 6 watts c) 120 watts d) 720 watts P = I V = 60 amps x 12 volts = 720 watts E.2 = d 11-15

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E.3 How much energy (in joules) did the battery in Exercise E.1 supply ? a) 1,200 joules b) 6,000 joules c) 7,200 joules d) 144,000 joules e) 198,000 joules solve P = E/t for E: E = P t = 720 watts x 10 sec = 720 joules x 10 sec = 7,200 J sec OR use E pot = Q V = 600 coul x 12 V = 7,200 J E.3 = c E.4 A rechargeable 1.25 volt AA battery for a CD player is rated at 0.6 amp-hours. How much charge (in coul) is 0.6 amp-hours? (Hint:
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Per11_exercise - Solutions to Period 11 Exercises E.1 On a...

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