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# solution7 - fullwood (tf5349) Quiz 3 DC Circuits Catala...

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fullwood (tf5349) – Quiz 3 DC Circuits – Catala – (12054) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 10.0 points A 2 cm length of tungsten Flament in a small lightbulb has a resistance of 0 . 025 Ω. ±ind its diameter. (The resistivity is 5 . 6 × 10 - 8 Ω · m). Correct answer: 0 . 238833 mm. Explanation: Let : L = 2 cm = 0 . 02 m , R = 0 . 025 Ω , and ρ = 5 . 6 × 10 - 8 Ω · m . Resistance is R = ρ L A = ρ L π p d 2 P 2 = 4 ρ L π d 2 , d = r 4 ρ L π R = R 4 (5 . 6 × 10 - 8 Ω · m) (0 . 02 m) π (0 . 025 Ω) × p 1000 mm 1 m P = 0 . 238833 mm . 002 10.0 points Consider the circuit I 38 V S 11 Ω 7 . 4 Ω 15 Ω 16 Ω ±ind the equivalent resistance. Correct answer: 19 . 4163 Ω. Explanation: I E S R 2 R 3 R 4 R 1 Let : R 1 = 16 Ω , R 2 = 11 Ω , R 3 = 7 . 4 Ω , and R 4 = 15 Ω . R

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## This note was uploaded on 06/10/2010 for the course PHY 100 taught by Professor Pro.kiroshima during the Spring '10 term at Adelphi.

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solution7 - fullwood (tf5349) Quiz 3 DC Circuits Catala...

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