Answer: rho/a.
- A rho/a
- B rho x a
- C rho
- D rho/a<sup>2</sup>
Correct answer: A. rho/a
Explanation: R = rho x L/A. L = a (length between faces), A = a<sup>2.</sup> R = rho x a/a<sup>2</sup> = rho/a.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.