Question about resistance in a circuit

1. Mar 29, 2008

skwz

Since:
$$R = \rho \frac{\ell}{A}$$
When calculating resistance in a circuit and lets say there are no resistors in the circuit, does $$\ell$$ represent the length of the entire circuit (e.g. the length of the entire wire) or only the length across the battery?

2. Mar 29, 2008

wudingbin

it should be the length of entire wire

3. Mar 30, 2008

KnowPhysics

yes, l - length of the entire wire.