Part AWhat is the internal resistance of a 12.0-V car battery whose terminal voltage drops to 9.3 V when the starter motor draws 84 A ?Express your answer to two significant figures and include the appropriate units.HẢ?r =ValueUnitsSubmitRequest AnswerPart BWhat is the resistance of the starter?Express your answer to two significant figures and include the appropriate units.HÀ?R =ValueUnits

Emf of car battery (E) = 12 volts Terminal voltage (V) = 9.3 volts Current (I) = 84 A Let the…

Part A What is the internal resistance of a 12.0-V car battery whose terminal voltage drops to 9.3 V when the starter motor draws 84 A ? Express your answer to two significant figures and include the appropriate units. µA ? Value Units r = Submit Request Answer Part B What is the resistance of the starter? Express your answer to two significant figures and include the appropriate units. HA R = Value Units

Part A What is the internal resistance of a 12.0-V car battery whose terminal voltage drops to 9.3 V when the starter motor draws 84 A ? Express your answer to two significant figures and include the appropriate units. µA ? Value Units r = Submit Request Answer Part B What is the resistance of the starter? Express your answer to two significant figures and include the appropriate units. HA R = Value Units

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 25P: A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of...

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A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in °C/min ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.300 kcal/kg • °C, assuming no heat escapes?
Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?
Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?
For the network in Figure P18.60, show that the resistance between points a and b is Rab=2717. (Hint: Connect a battery with emf across points a and b and determine /I, where I is the current in the battery.) Figure P18.60
A car battery with a 12-V emf and an internal resistance of 0.050 is being charged with a current of 60 A. Note that in this process the battery is being charged. (a) What is the potential difference across its terminals? (b) At what rate is thermal energy being dissipated in the battery? (c) At what rate is electric energy being converted to chemical energy? (d) What are the answers to (a) and (b) when the battery is used to supply 60 A to the starter motor?
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