Resistance through wires
Introduction
Electrical resistance is a measure of a materials opposition to the flow of an electric charge. Resistance is usually given the symbol 'R'. The unit for electrical resistance is the ohm.
Ohm's law is the voltage drop (V) across a resistor proportional to the current running through it. The main causes of resistance to electrical flow in metal are imperfections impurities and temperature caused by the fact that electrons collide with the atoms creating heat.
Aim:
To find out how the length of a piece of wire affects the resistance.
Variables
Variable
How I control it
Material of wire
Use the same material. Different materials have alternate atomic structures, conductivity i.e. inbuilt resistance, also some materials have more impurities than others.
Introduction
Electrical resistance is a measure of a materials opposition to the flow of an electric charge. Resistance is usually given the symbol 'R'. The unit for electrical resistance is the ohm.
Ohm's law is the voltage drop (V) across a resistor proportional to the current running through it. The main causes of resistance to electrical flow in metal are imperfections impurities and temperature caused by the fact that electrons collide with the atoms creating heat.
Aim:
To find out how the length of a piece of wire affects the resistance.
Variables
Variable
How I control it
Material of wire
Use the same material. Different materials have alternate atomic structures, conductivity i.e. inbuilt resistance, also some materials have more impurities than others.
