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AP® Physics 1 & 2

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Moderate

The Unknown Resistance

APPH12-PNZWXO

The circuit shown below consists of a battery of negligible internal resistance and two resistors,
(${R}_{1}= \text{ 6.0 Ohms and } {R}_{2}$). The resistance of the connecting wires is also negligible.

  • The current entering point X in the circuit is 3.0 Amps.
  • The current leaving point X and going into the lower 'branch' (containing ${R}_{2}$) is 1.0 Amp.

What is the value of ${R}_{2}$?

Created for Albert.io. Copyright 2016. All rights reserved.

A

3.0 Ohms

B

6.0 Ohms

C

12 Ohms

D

The value for ${R}_{2}$ cannot be determined, as no voltage is given.