SAT Subject Physics Practice Question 460: Answer and Explanation

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Question: 460


The electrical circuit shown has 1 ampere of current flowing in it. Answer the questions about the parts of the circuit listed between the points below by choosing the letter that correctly represents the quantity in question.

Between which two points is the resistance value the largest?

A. Between points A→B
B. Between points B→C
C. Between points C→D
D. Between points D→E
E. Between points E→A

Correct Answer: C


The correct answer is (C). The largest effective resistance in the circuit comes from the 6 ohm resistor even through there is a 12 ohm resistor in the circuit. The 12 ohm resistor is in parallel with a 4 ohm resistor, which gives the parallel network circuit resistance of only 3 ohms.

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