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Voltage Divider Circuits
37 questions By Tony R. Kuphaldt
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Question 25 of 37
One of the resistors in this voltage divider circuit is failed (either open or shorted). Based on the voltage readings shown at each load, determine which one and what type of failure it is:
Reveal answerResistor R1 has failed shorted.
Follow-up question: note that the voltage at load #2 is not fully 25 volts. What does this indicate about the nature of R1’s failure? Be as specific as you can in your answer.
Notes:Discuss with your students how they were able to predict R1 was the faulty resistor. Is there any particular clue in the diagram indicating R1 as the obvious problem? Some students may suspect an open failure in resistor R3 could cause the same effects, but there is a definite way to tell that the problem can only come from a short in R1 (hint: analyze resistor R2).
Explain that not all “shorted” failures are “hard” in the sense of being direct metal-to-metal wire connections. Quite often, components will fail shorted in a “softer” sense, meaning they still have some non-trivial amount of electrical resistance.
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Question 26 of 37
One of the resistors in this voltage divider circuit has failed (either open or shorted). Based on the voltage readings shown at each load, comparing what each load voltage is versus what it should be, determine which resistor has failed and what type of failure it is:
Reveal answerResistor R4 has failed open.
Notes:Use this question as an opportunity to discuss troubleshooting strategies with your students. A helpful hint in dealing with this kind of problem is to categorize each load voltage as either being greater or less than normal. Forget the negative signs here: we’re dealing strictly with absolute values (in other words, -25 volts is a “greater” voltage than -20 volts). Once each load voltage has been categorized thusly, it is possible to isolate the location and nature of the fault without having to deal with numbers at all!
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Question 27 of 37
One of the resistors in this voltage divider circuit has failed (either open or shorted). Based on the voltage readings shown at each load, comparing what each load voltage is versus what it should be, determine which resistor has failed and what type of failure it is:
Reveal answerResistor R3 has failed shorted.
Notes:Use this question as an opportunity to discuss troubleshooting strategies with your students. A helpful hint in dealing with this kind of problem is to categorize each load voltage as either being greater or less than normal. Forget the negative signs here: we’re dealing strictly with absolute values (in other words, -25 volts is a “greater” voltage than -20 volts). Once each load voltage has been categorized thusly, it is possible to isolate the location and nature of the fault without having to deal with numbers at all!
Plus signs are missing from these questions and answers, such as in question 11, where the denominator of the voltage divider equation appears as “R1 R2 R3” instead of “R1+R2+R3”. Same in the answer to question 15. Likely elsewhere as well, as Find shows no results for “+” anywhere on the page. I’m using Chrome 88.0.4324.182 on Windows 10, but same on Firefox & Edge. HTML source for the page shows it as “R1 R2 R3”, so it isn’t just a display problem.
Iam a student and i need an explain for this answers how can I get an explanation ?
Ca any one tell in detail how
The formula got formed like this !! ( ER= Et(R/Rt)) thank you