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

Investigation to find how the length of wire affects the resistance in a circuit.

Extracts from this document...

Introduction

Investigation to find how the length of wire affects the resistance in a circuit

Hypothesis

I hypothesize that the greater the length of wire, the greater the resistance will be. I also hypothesize that the resistance will increase in proportion to the length of wire.

Integrated Science 1, pg. 138, backs up my hypothesis.

What is current?: Current is the speed with which electrons flow around a circuit. The higher the current, the higher the speed with which electrons flow. Current is measured in amps.

Note: in formulae, current is referred to as ‘I’ as opposed to ‘A’ or ‘C’, as current used to named the ‘electrical intensity’.

What is voltage?: A volt is a joule per coulomb. A joule is a unit of energy, and a coulomb is a measure of charge. A coulomb is equal to 6.25 billion electrons. Therefore, a volt is general measure of energy.

Voltage is referred to as ‘V’ in formulae.

What is resistance, and how does it occur?

...read more.

Middle

Results

1.5 Volts

3 Volts

4.5 Volts

Length (centimeters)

Current (amps)

Voltage (volts)

Resistance (Ohms)

Current (amps)

Voltage (volts)

Resistance (Ohms)

Current (amps)

...read more.

Conclusion

There is a pattern in the graph. If you were to double the length, the resistance would double accordingly.

The results table shows me that as the length of wire increases, so does the resistance.

From my graph, I can make new predictions. If the length of wire was 110 cm, I predict that the resistance would be approximately 7.5 ohms. I predicted this by carrying on the line of best fit.

Conclusion

From my results, I can conclude that my hypothesis was correct, and from my graph I can conclude that all the results agree with my hypothesis.

Discussion

I know that the movements of electrons is inhibited in a wire if there is not enough space for them to flow through, and this is called resistance. I know that a higher voltage is needed to push the current though a circuit.

The resistance in a circuit can be calculated by R = V / I.

Evaluation

...read more.

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

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Investigate how mass affects the diameter of an impact crater.

    Also a small fraction of energy would have been in the form of waste to sound. * A more practical influence would have been the constant height. When the boss for the plasticine was positioned, it may have not been precisely 1 metre as the metre ruler was placed on the opposite side.

  2. "Are rechargeable batteries more economical than alkaline batteries?"

    3 The amount of voltage and current a cell produces depends on the type of chemicals used to react with; while the endurance of a battery depends on the amount of active material within the battery and its actual design.

  1. Physical - Circuit

    When we test the copper wire of 100cm long with 0.9mm diameter into water, it have a results of room temperature with low resistance, when the water were starting to boil, the current and the voltage both raise, and the resistance also raise with 0.5ohms.

  2. Investigating how the length of a piece of wire affects resistance in a circuit.

    These free electrons are negatively charged and collide along the line of atoms in a wire. Resistance is caused by these free electrons flowing towards the positive terminal collide with atoms. If we double the length of wire the number of atoms doubles so the number of electrons colliding also doubles so twice the amount of energy is required.

  1. An investigation to find out if the length of a wire affects the resistance ...

    The resistance uses up the energy leaving only a small amount left to travel back to the cell (look at diagram B). Background science Here are some of the scientific reasons why I chose my prediction and what affected my thoughts.

  2. An investigation to find out how the length of wire affects its resistance

    Metal can conduct electricity well because their atoms do not hold on to the electrons to well. Free electrons carry a negative charge when they collide with ions they transfer some of there energy, this transfer when they collide causes the resistance.

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