Physics 1 Problem Solutions 217

Physics 1 Problem Solutions 217 - Chapt. 28 Circuits 213 a...

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Unformatted text preview: Chapt. 28 Circuits 213 a negative terminal. Ideally, the device maintains the potential difference at a constant value and the separated charge structure no matter what current flows through the device from the negative terminal to the positive terminal and then from the positive terminal to the negative terminal through an external circuit. In real cases, the potential usually decreases when current flows. Since electrical potential energy is lost as current flows from high to low potential in the external circuit, the device must convert energy from some form into electrical potential energy by forcing the current to flow from negative to positive terminals internally. What is a/an device, Alex? a) fme b) mfe c) mef d) efm e) emf 028 qmult 00220 1 1 3 easy memory: internal resistance 7. Real emf devices are not perfect because of: a) magnetic fields. b) electric fields. c) internal resistance....
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