Aim: To investigate how the Resistance of a Constantan Wire is affected by its length
Introduction: In this experiment we will be investigating how changing the
length of a piece of Constantan wire will affect the resistance.
Therefore the length will be an independent variable and all of
the other variables we will try to keep the same. The other
variables included in this experiment are temperature, thickness
of wire and density of wire. Resistance is a force, which
opposes the flow of an electric current around a circuit so that
energy is required to push the charged particles around the
circuit
Key factors:
- Thickness of the wire: if the wire is thin, the electrons are forced to travel through a smaller area, therefore colliding more frequently, resulting in them giving up more of their energy to surrounding particles.