Question

Problem #1 (Concepts) Circle the correct answer or fill in the blank. (3 points each) a) Kirchhoffs "law" is a consequence of (conservation of charge conservation of energy both none) b) What is the time constant of the circuit shown below? Each of the five resistors has a resistance R, and each of the five capacitors has capacitance C. The internal resistance of the battery is negligible. (RC 5RC 10RC25RC) vünün = = = AV c) A power supply will deliver the maximum amount of power to a load when the resistance of the load is (greater than equal to less than) the internal resistance of the power supply. d) Several resistors are connected in parallel. Which of the following statements are correct? (The equivalent resistance is less than any of the resistance in the group. The equivalent resistance depends on the voltage applied across the group. The equivalent resistance is equal to the sum of the resistances in the group. None of the statements are correct) e) Two 120 Volt light bulbs, one 25 Watts and one 200 Watts, were connected in series across a 240 Volt line. It seemed like a good idea at the time, but one bulb burned out almost immediately. Which one burned out and why? (5 points)

Answer 1

1 (a) (6) Kirchhoff's law is a consequence of conservation of both Charge and energy Rey - SR Ceq = 50 Time constant - Rag Car -5Raso 25RC stalonents :- . (all correct - Equnalent resistance is less than any of the resestone in the group e) Bulbi pa v 25 - 26 - 57 62 = 2.) llly, R2 = (120)2 722 I. = P 25. o. 125A In 200 1.66A 120 149 ه = آرمقنعه من المطعمدہ) رسو بي 0 Since Roq 576+72) – 0.37A now current is current in I bulle in initial cose Ist bulb (250) will burn out.