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Exam 1 Solutions - General Physics Electric, Magnetic and Optics | PHYS 112, Exams of Physics

Lafayette CollegePhysics

Material Type: Exam; Class: General Physics-Elec, Mag, Opt; Subject: Physics; University: Lafayette College; Term: Unknown 1989;

Typology: Exams

Pre 2010

Uploaded on 08/19/2009

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Download Exam 1 Solutions - General Physics Electric, Magnetic and Optics | PHYS 112 and more Exams Physics in PDF only on Docsity!

Phys 112-01 Test 1 Name: Ss SLU TIONS Page 5 4. (30 pts.) When a powerful appliance switches on, the lights on the same circuit often dim noticeably. In this problem, you will calculate this effect for the following idealized simplified circuit. Resistance R, represents the total resistance in the wires, Ry is a light bulb, and Ry is a motor. (For the purposes of this problem, assume that all these resis- tances are fixed, constant values.) VW R, = 0.4000 R, R; 120V —== T bulb Motor a. (15 pts.) When the motor is off (or disconnected), a total current of 0.626 A pass- es through R,. What is the power dissipated by the light bulb? Ry Rs (aev Re — (zo = | - £ tacv t= Re nde Ae VRoVv Ovvae Re AEN > ez BM ata s © C264 Now Ros Rit RD Rez Re~R, =10L-7- 0-4 Raz 141.32. Lastly é, > T®- V.T, = (te) 2: The, Pi> (6, Cae) (14-3) 2(75.0W |