phys 500 circuits

phys 500 circuits - What happens to the brightness of bulb...

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A S B C E D What happens to the brightness of bulb A when the switch is closed?
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Current Model Current Model
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Rank the bulbs A C B Compare A to D D F E G A>D Bulb F is added in series so resistance increases, reducing the current through the battery in the bottom circuit. A and D are both getting all the current so A>D.
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Rank the bulbs A C B Compare A to D A<D Bulb F is added in parallel so resistance decreases, increasing the current in the battery in the bottom circuit. A and D are both getting all the current so A<D. D F E G
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Review of Current Model More flow more glow. The current  through the battery  depends  on the  resistance of the circuit . It’s not what you add but how you add it. Current favors the path of least resistance. Branches connected directly to a battery  are independent.  
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When are elements in series? Elements in series share the current.
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When are elements in series? Whatever charge goes through one  element must  be the only charge that  passes through the other (no other path). Must have the same current. Need scissors to add something in series.
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When are elements in parallel? At a junction, charge must choose to flow 
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phys 500 circuits - What happens to the brightness of bulb...

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