# The aim of this investigation is to find out how the resistance of a wire is affected by its lengths. I will do this by changing its lengths and working out each lengths potential difference and current.

EXPERIMENT TO FIND THE AFFECT THAT THE LENGTH OF A WIRE HAS ON ITS RESISTANCE

Introduction

The aim of this investigation is to find out how the resistance of a wire is affected by its lengths. I will do this by changing its lengths and working out each lengths potential difference and current. The reason that I am measuring the potential difference and the current of the circuit is because the formula for resistance is.

or    or
(resistance= ohms (
Ω), potential difference= volts (V), current= amperes (A))

Electricity is the movement of charged electrons inside an insulator and it is also a form of energy. The constant variables in this experiment will be:

• The temperature: the hotter the inside of a metal the more active the electrons are and the more collisions they will make with the walls of the wires making it harder for the current to pass though
• The material of the wire: different metals have different resistances and will give you unreliable results
• The thickness of the wire: the thinner the wires are the less current can pass through it at one time.

The independent variable will be the length of the wires as we are trying to find out its affects on the resistance. The independent variable affects the dependant variable as in that when you change the independent variable the value of the dependant variable will change. The dependant variable in this case would be the resistance of the wires and it will change as the length of the wire changes.

Hypothesis: I think that the resistance of the wire will be higher when it is longer. This is because the electrons have further to travel than inside the smaller ...