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Resistance Of A Wire - page 1

Keywords: Resistance Of A Wire

By RyanJK on 07/11/2006 17:49:43

Level: GCSE Key Stage 4 (Years 10-11)

Page Number: 1 of 5   pages: 1 2 3 4 5

GCSE Physics Coursework - Resistance of a Wire Coursework

Resistance of a Wire:
Aim:
In this investigation I want to find out the resistance of a piece of wire at varying lengths. I also want to find out if there is a relationship between the length of a piece of wire and its resistance.
Background Information:
What Is Electricity?

Electricity is a form of energy. It is generated by millions of free-flowing electrons whose movements create force fields and generate energy from motion.

What is resistance?

Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. it has less resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat. It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities. These collisions convert some of the energy that the free electrons are carrying into heat.


How is it measured?

The resistance is measured in ohms (Ω). The resistance of a length of wire is calculated by measuring the current present in the circuit (in series) and the voltage across the wire (in parallel). These measurements are then applied to this formula:

V = I x R where V = Voltage, I = Current and R = Resistance

This can be rearranged to:

R = V
I

Ohmís Law
It is also relevant to know of Ohmís Law, which states that the current through a metallic conductor (e.g. wire) at a constant temperature is proportional to the potential difference (voltage). Therefore V ł I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with

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Resistance Of A Wire- page 1