# Homework Help: Width of wire

1. Feb 19, 2007

### scotty0409

What is the effect of increasing the width of a wire on it's resistance, and why?

Thanks
Neil

2. Feb 19, 2007

### cristo

Staff Emeritus
What do you think? Do you know the structure of a metal/solid?

3. Feb 19, 2007

### scotty0409

Does it decrease because there are more electrons to move freely?

4. Feb 19, 2007

### ranger

You pretty much got it. Just think of a pipe where you can vary the diameter to affect the water flow.

5. Feb 19, 2007

### scotty0409

ok thanks for the help

6. Feb 19, 2007

### Staff: Mentor

So now that you've figured it out with help from ranger, here is the general equation that you should memorize (yes, there are a handful of equations that you should memorize):

$$R = \frac{\rho L}{A}$$

So an increase in the "width" of a conductor increases the area of the conductor, which does what?

7. Mar 4, 2007

### scotty0409

Sorry, but what does pL represent?

8. Mar 4, 2007

### ranger

p = static resistivity of material and L = length of specimen.

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