Test 3 (Chapter 17) Begin Date: 7/10/2015 5:00:00 AM Due Date: 7/11/2015 11:59:0

Question

Test 3 (Chapter 17) Begin Date: 7/10/2015 5:00:00 AM Due Date: 7/11/2015 11:59:00 PM End Date: 7/11/2015 11:59:00 PM (10%) Problem 1: A car battery has a voltage of E 12 V. To turn the starter on a car the battery must supply I 343 A. It takes t s for the engine to start A 50% Part (a) Input an expression for the total charge passed through the starter,e Grade Summary Deductions Potential 100% Submissions 0 7 8 9 Attempts remaining 3 (3% per attempt) 4 5 6 detailed view 1 3 Submit Hint I give up! Hints deduction per hint. Hints remaining Feedback 30% deduction per feedback. A 50% Part (b) How much energy did the starter consume, E, in J?

Explanation / Answer

given,

voltage = 12 V

current = 343 A

time = 4 sec

current = charge / time

charge = current * time

charge = 343 * 4

charge = 1372 A

power = current * voltage

power = 343 * 12

power = 4116 watt

also,

power = energy / time

4116 = energy / 4

energy = 16464 J

energy starter will consume = 16464 J

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