Physics Review Question
Unit: Electricity
Year: 1989 Question#: 37
Question: Which circuit segment has an equivalent resistance
of 6 ohms?
(1 )  |
(2 )  |
(3 )  |
(4 )  |
What is this question really asking?
Explanation by: Yui H.
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Answer 1
incorrect
This answer is incorrect because in series circuits, total resistance = R1 + R2 + R3 + ... In this case, 3 ohms + 2 ohms equals 5 ohms. return to top
Answer 2
incorrect
This answer is incorrect because in parallel circuits, 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ... In this case, 1/Rtotal equals 1/3 + 1/2 and that is 2/6 or 1/3. Resistance in this answer is 3 ohms. return to top
Answer 3
correct
This answer is correct because in series circuits, total resistance = R1 + R2 + R3 + ... In this case total resistance is 2+2+2 and this equals 6 ohms. return to top
Answer 4
incorrect
This answer is incorrect because in parallel circuits, 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ... In this case, 1/Rtotal equals 1/2 + 1/2 + 1/2 that is 3/2 and total resistance is 2/3 ohms. return to top
What's this question really asking?
This question is really asking you if you can calculate the effective resistance in both series circuits and parallel circuits. return to top
