# HW7 - yun (bsy72) – Homework 7 – Hoffmann – (56745) 1...

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Unformatted text preview: yun (bsy72) – Homework 7 – Hoffmann – (56745) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The emf of a battery is E = 18 V . When the battery delivers a current of 0 . 5 A to a load, the potential difference between the terminals of the battery is 16 V volts. Find the internal resistance of the battery. Answer in units of Ω. 002 10.0 points Four copper wires of equal length are con- nected in series. Their cross-sectional areas are 1 . 6 cm 2 , 1 . 2 cm 2 , 4 . 4 cm 2 , and 7 cm 2 . If a voltage of 140 V is applied to the ar- rangement, determine the voltage across the 1 . 2 cm 2 wire. Answer in units of V. 003 10.0 points Four resistors are connected as shown in the figure. 2 1 Ω 5 4 Ω 8 3 Ω 91 V 39Ω S 1 a b c d Find the resistance between points a and b . Answer in units of Ω....
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## This note was uploaded on 10/28/2010 for the course PHY 12343 taught by Professor Turner during the Spring '10 term at University of Texas.

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HW7 - yun (bsy72) – Homework 7 – Hoffmann – (56745) 1...

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