In the circuit shown in (Figure 1) both batteries haveinsignificant internal resistance and the idealized ammeterreads 1.20 A in the direction shown.Figure1 of 1E=?75.0 VI12.0 Ω(А48.0Ωww15.0ΩPart AFind the emf & of the battery.Express your answer in volts.—| ΑΣΦE =SubmitRequest AnswerPart BIs the polarity shown correct?yesnoSubmit Request Answer?V

Answered: Image /qna-images/answer/0b6f7583-63c6-41fa-b338-cd87ce939939.jpg

In the circuit shown in (Figure 1) both batteries have insignificant internal resistance and the idealized ammeter reads 1.20 A in the direction shown. Figure < 1 of 1 E=? 75.0 V 12.0 Ω -www- 48.0 Ω 15.0 Ω Part A Find the emf & of the battery. Express your answer in volts. [5] ΑΣΦ E = Submit Request Answer Part B Is the polarity shown correct? O yes O no Submit Request Answer ? V

In the circuit shown in (Figure 1) both batteries have insignificant internal resistance and the idealized ammeter reads 1.20 A in the direction shown. Figure < 1 of 1 E=? 75.0 V 12.0 Ω -www- 48.0 Ω 15.0 Ω Part A Find the emf & of the battery. Express your answer in volts. [5] ΑΣΦ E = Submit Request Answer Part B Is the polarity shown correct? O yes O no Submit Request Answer ? V

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 45P: A child's electronic toy is supplied by three 1.58-V alkaline cells having internal resistances of...

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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?
The power dissipated in a resistor is given by P = V2/R, which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases. Explain why there is no contradiction here.
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