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# hw 1 - principle of conservation of energy giving the...

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EECE 519 Homework 1 (Due Thursday, January 24) 1. When a car has a dead battery, it can be started by connecting the battery from another car across its terminals as shown in the Figure below. If the current I = -50A, which car has the dead battery? If the connection is maintained for 2 min, how much energy is transferred to the dead battery? Car A 12 V Car B 12 V I + + Power flow is from A to B. Car B has the dead battery. P= vi = -12(-50) = 600W, w = integraltext t o 600 dt = 600 t | 2 × 60 sec o = 600(2 × 60) = 72 kJ 2. In the circuit shown determine how much power is absorbed or how much power is delivered by each circuit element.
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Unformatted text preview: principle of conservation of energy giving the reason for your answer. Note: Power is is expressed as a positive number. c-v c + I c e + v e-I e f + v f-I f d-v d + I d a + v a-I a b-v b + I b g-v g + I g h + v h-I h Element Voltage (V) Current (A) Power (W) abs/del a 5 2 10 abs b 1 3 3 del c 7-2 14 abs d-9 1 9 abs e-20 5 100 del f 20 2 40 abs g-3-2 6 del h-12-3 36 abs Total power absorbed = 10 + 14 + 9 + 40 + 36 = 109 W Total power delivered = 3 + 100 + 6 = 109 W, satis²es Power check....
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