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Unformatted text preview: wright (daw2557) – Chapter 26 – de – (14443) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A typical color television draws about 2 . 8 A when connected to a 102 V source. What is the effective resistance of the T.V. set? Correct answer: 36 . 4286 Ω. Explanation: Let : I = 2 . 8 A and V = 102 V . The resistance is R = V I = 102 V 2 . 8 A = 36 . 4286 Ω . 002 10.0 points A conductor with crosssectional area 4 cm 2 carries a current of 15 A. If the concentration of free electrons in the conductor is 8 × 10 28 electrons / m 3 , what is the drift velocity of the electrons? Correct answer: 0 . 00292571 mm / s. Explanation: Let : I = 15 A , n = 8 × 10 28 electrons / m 3 , q e = 1 . 60218 × 10 19 C , and A = 4 cm 2 = 0 . 0004 m 2 . The current in a conductor is given by I = n q v d A , where n is the number of charge carriers per unit volume, q is the charge per carrier,...
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This note was uploaded on 03/23/2011 for the course PHYS 1444 taught by Professor Sureshsharma during the Spring '09 term at UT Arlington.
 Spring '09
 SURESHSHARMA
 Physics

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