Hi, I'm having a bit of trouble with a potential divider question. I have an answer but I'm not sure if its right and if not, why its not right. I've attached a crude drawing of my problem below, I have a question asking what the output voltage is (between P and Q terminals) with the given resistances in ohms and battery of p.d. 6V. I think what is confusing me is the line drawn between C and D. Anyway, I know that the output voltage is the resistance across where the circuit is divided x current in circuit. The problem I had was whether to work out the effective resistance of the 2 resistors in parallel (the 800 and 400). I worked out total resistance in the whole circuit to be 400ohms (1/600 + 1/1200=1/Rtot). The current turned out (V=IRtot) as 0.015A. So working out output voltage I got 0.015 x Reff (1/400 + 1/800= 1/Reff) which gave an output of 4V which seemed like a reasonable answer. This was by simplifying the 4 resistors into 2 resistors in series. The problem with this is that the next question asks if there is a current flowing in this wire (CD) and if so what direction (as conventional current). Given how I have simplified the 4 resistors, and that the P output terminal will be +ve I would say that conventional current will be flowing from C to D? But I am confused because there are actually 4 resistors which is the problem.(adsbygoogle = window.adsbygoogle || []).push({});

Sorry I've made such an essay out of it, but I'm very confused, I've had no trouble with the more simple potential divider questions but this 1 was totally different. I'm not entirely convinced of my answer to the output voltage. I would appreciate if someone did a quick check on my work and maybe explain this circuit to me and anything I've got wrong. Thanks very much, Jamie

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# Homework Help: Archived Potential Divider

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