How Does the Length of a Wire Affect Its Resistance?

2. depends on the material

AIM

My aim is to find out if the length of a wire affects its resistance.

PREDICTION

My prediction is that if the length of a wire increases the resistance increases. I predict this using the idea of free electrons, e.g.

Within the metal atoms there are free electrons, it is these free electrons which provide the conductivity of metals. The free electrons have to move in order to provide the current, the slower they move, the more the resistance, the faster they move, the less resistance. Therefore, if the wire is long then that means that the free electrons have to travel further, they have to dodge more metal atoms-this slows the speed of their movement, and so the resistance increases.

FAIR TEST

In this investigation I'm going to keep three things the same, which are:

. The width of the wire: if the wire were thick, there would be more metal atoms so therefore, the free electrons would have to dodge more atoms, this could slow them down and so the resistance could increases. If the wire is thin then there are less metals atoms, so less to dodge and this could speed up the movement and so there is less resistance.

2. The temperature:

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