# SAT Subject Physics Practice Question 182: Answer and Explanation

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**Question: 182**

**28.**

All six resistors in the circuit have the same resistance, *R*, and the battery is a source of constant voltage, *V*.

How does the current through Resistor *a* compare with the current through Resistor *b* ?

A. The current through Resistor *a* is 9 times the current through Resistor *b*.

B. The current through Resistor *a* is 3 times the current through Resistor *b*.

C. The current through Resistor *a* is the same as the current through Resistor *b*.

D. The current through Resistor *b* is 3 times the current through Resistor *a*.

E. The current through Resistor *b* is 9 times the current through Resistor *a*.

**Correct Answer:** B

**Explanation:**

The current entering the parallel combination containing Resistors *b*, *c*, and *d* will split evenly among the resistors since all their resistances are the same. Because there are 3 resistors in the parallel combination, each resistor in this combination will get 1/3 of the current. Another way of saying that the current through Resistor *b* is 1/3 the current through Resistor *a* is to say that the current through Resistor *a* is 3 times the current through Resistor *b*.