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Unformatted text preview: Solution for Homework 11 Beginning Circuits Solution to Homework Problem 11.1(What is the same in parallel?) Problem: For a parallel combination of unlike resistors, which of the following is the same for each resistor? Select One of the Following: (a) Current (b-Answer) Potential difference (c) Heat Produced (d) Power dissipated Solution Two resistors in parallel will both have the same potential difference for all values of current through the circuit. Total Points for Problem: 1 Points Solution to Homework Problem 11.2(Intensities of Bulbs in a Series Circuit When Another Bulb is Added) Problem: Several lightbulbs are connected in series. What happens to the brightnesses of the bulbs when an additional bulb is connected in series with the rest? Select One of the Following: (a) The bulbs get brighter. (b) The bulbs stay the same brightness. (c-Answer) The bulbs get dimmer. (d) It depends on the properties of the bulb added, so it can’t be determined from the information given. (e) None of the above. Solution When another bulb is incorporated into the circuit, the resistance of the entire circuit increases. This results in less current in the entire circuit and in the lamps in the circuit. Less current through the bulbs means that the bulbs will dim. Total Points for Problem: 3 Points Solution to Homework Problem 11.3(Voltage Across Parallel Resistor) 1 Problem: In the resistance network to the right all resistors are 2Ω and the battery is 6V . Calculate the current through R 3 . Select One of the Following: (a) 6 / 5A (b-Answer) 3 / 5A (c) 5 / 6A (d) 5 / 12A (e) 5 / 3A R 1 R 3 R 2 R 4 Solution The equivalent resistance of the parallel circuit is 1 R p = 1 R 2 + 1 R 3 or R p = 1Ω . The equivalent circuit with the parallel resistor reduced is drawn to the right. The equivalent resistance of the full circuit is then R eq = R 1 + R + p + R 4 = 5Ω . The current drawn by the circuit is then...
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This note was uploaded on 03/29/2010 for the course PHYS 2469 taught by Professor Stewat during the Spring '10 term at University of Arkansas Community College at Batesville.
- Spring '10