# 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.