33_Chapter 18 HomeworkCH18 Direct-Current Circuits

33_Chapter 18 HomeworkCH18 Direct-Current Circuits -...

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Direct-Current Circuits 131 18.52 With the switch open, the circuit may be reduced as follows: ±²³ ± ± ² ³ ± ³´³±²³ ± ² ³ µ²³ ± ¶²³ ± µ²³ ± ¶²³ ± ± ² ³ ¶²²³ ± ¶²²³ ± ± ² ³ With the switch closed, the circuit reduces as shown below: µ²³ ± ¶²³ ± ± ² ³ ¶²³ ± µ²³ ± µ³ ± ± ² ³ µ³ ± ± ³´³¶·³ ± ² ³ Since the equivalent resistance with the switch closed is one-half that when the switch is open, we have () 1 18 50 2 RR +Ω = , which yields 14 R = 18.53 When a generator with emf ε and internal resistance r supplies current I , its terminal voltage is VI r ∆=− 0 V I . If when
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