31_Ch 18 College Physics ProblemCH18 Direct-Current Circuits

31_Ch 18 College Physics ProblemCH18 Direct-Current...

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Direct-Current Circuits 129 ± ±²³³´µ ¶·²³´ ² ± ± · ± ¸ ¸²³³ ¹ ² ¶³²³ ³ º ² ¶»²³ ¹ ² ) 18.49 (a) From ( load Ir R ε =+ , the current supplied when the headlights are the entire load is () 12.6 V 2.48 A 0.080+5.00 load I rR == = +Ω The potential difference across the headlights is then 2.48 A 5.00 12.4 V load VI R ∆= = Ω= (b) The starter motor connects in parallel with the headlights. If is the current supplied to the headlights, the total current delivered by the battery is The terminal potential difference of the battery is hl I I r 35.0 A hl II V =− , so the total current is ( ) IV r while the current to the headlights is 5.00 hl = ∆Ω . Thus, becomes 35.0 A hl 35.0 A 0 VV
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This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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