• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3

# Investigating to factors that affect the resistance of a metal conductor

Extracts from this document...

Introduction

Investigating to factors that affect the resistance of a metal conductor

All metals offer some resistance to the flow of an electric current. Several factors affect the resistance:

• Temperature
• Length
• Cross-section area
• The metal or alloy the conductor is made of

This investigation looks at the effect of length.

## Why does resistance occur?

Resistance occurs because the electrons in the wire have to collide to pass on electrical current. When the electrons collide, they lose some of their kinetic energy.

## What is resistance?

Resistance is an opposition to the flow of electrons. It is the potential difference divided by the current.

## How is resistance measured?

Resistance is measured in ohms (Ω) using an ohmmeter (    Ω    ).

## Ohms Law

Resistance is worked out using the following scientific model (Reference from Roger Muncaster’s A level Physics):

## R=ρl

A

Ifρ and A are fixed by choosing one

Middle

Potential Difference across wire, V (V)

Current, I (A)

Conclusion

## Evaluation

There were no anomalies in this experiment. I think that there was enough evidence collected to support my conclusion. My results were repeated and the scatter on the graph is very small. This implies that the reliability of the evidence is very good.  If I could improve this experiment in any way, I would have used a greater length of wire and more readings, to 200cm maybe, and I would have repeated the experiment 3 times instead of 2. Also, it is important to minimise current in the circuit to reduce the effects of joule heating.

James Taylor 4N

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Electricity and Magnetism essays

1. ## The factors affecting the resistance of a metalic conductor.

4 star(s)

I predict that my results will obeys Ohm's Law, which means that the current will increase in proportion to the voltage. Therefore if you double the voltage, the current will also double. I also predict that as the length of the wire gets larger so will the resistance.

2. ## Investigate one or more factors affecting the resistance of metal wires

I recorded the results in a table. I then repeated the experiment using a nichrome wire of diameter 0.31mm. This time, the current was 0.25A. I must use the same current throughout the series of experiments since it would affect the fairness of the test.

1. ## Discover the factors affecting resistance in a conductor.

A diode has a resistance that is only large one way; the other way it is very small. It conducts in one direction only and is a non-ohmic conductor. "GCSE Physics" by Tom Duncan, states that "this makes it useful as a rectifier for changing alternating current (a.c.)

2. ## What Factors Affect the Resistance of an Electrical Conductor?

The reason for this is in long wires the electrons have a larger surface to cover, which means it will take the electrons longer to travel from one end of the wire to the other. The reason for this is the collisions between the atoms and the electrons will be

1. ## Investigating the factors that affect the resistance of a metal wire

Prediction When I change the length of wire, I predict that the resistance of the wire will increase because, as already explained in my introduction, I know for a fact that as you increase the length of a metal wire you also increase the resistance.

2. ## Investigating Factors that Affect Resistance in Metal.

Ohms law says the current through a wire at a constant temperature is proportional to the voltage. Therefore Voltage x Current is constant. This means that the resistance of a wire is constant as long as the temperature also remains constant.

1. ## the resistance of a conductor is the opposition of the conductor to the current ...

The type of wire should definitely effect my results. If I used copper wire, there would be low resistance, due to coppers lack of positive ions, in comparison to if I used lead, I would find that high resistance would be shown, as lead has many more positive ions to attract the electrons that copper does.

2. ## Investigation into the factors which effect the resistance of a conductor.

Meter Ruler Two Crocodile Clips The factors, which must stay constant in this experiment to make it fair, are the output voltage from the power supply, which should remain the same throughout measuring. When there is not load on the power supply the voltage will rise until the power is being used when connected to the circuit.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to