Physics for Scientists and Engineers Storyline CENGAGE Tenth Edition Raymond A. Serway & John W. Jewett, Jr., Physics for Scientists and Engineers, Tenth Edition. © 2021 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. CENGAGE Chapter 27 Direct Current Circuits Raymond A. Serway & John W. Jewett, Jr., Physics for Scientists and Engineers, Tenth Edition. © 2021 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. CENGAGE Electromotive Force (1 of 2) b + a AV I R C d Ⓒ2021 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. CENGAGE Electromotive Force (2 of 2) AV = &- Ir ε = IR + Ir I = E R+r a E IR V E 0 a b a E + b C R ma d Ir Iε = I²R+ I²r © 2021 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. R M Quick Quiz 27.1 (1 of 2) To maximize the percentage of the power from the emf of a battery that is delivered to a device external to the battery, what should the internal resistance of the battery be? (a) It should be as low as possible. (b) It should be as high as possible. (c) The percentage does not depend on the internal resistance. CENGAGE © 2021 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.