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Wire and Resistance Investigation

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To start off the experiment we needed to gather all the apparatus needed. We then stick our wire using celotape to a metre rule. We then connect the circuit, ( see diagram). We then connect the crocodile clips to two different points of the wire depending on which distance we are using. The reason why we don’t cut the wire up and measure the resistance in an singular wire is because,

  • We are limited to the wire that is available.
  • There is no less degree of accuracy in using one long piece of wire and adjusting the crocodile clips along it.


I predict that as we increase the length of the wire, the voltage will increase as, generally speaking the longer the wire the greater the resistance.

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voltmeter is an instrument used to measure differences of electric , commonly called voltage, in volts or units that are multiples or fractions of volts.

Crocodile clips: These are used to connect all the appliances together and to also allow current to flow through them.

Metre rule: Used to measure how much wire we are using.

Wire: We are using this strip of wire to test the resistance of it.

What is the Circuit for?

A circuit is a path for electrons to flow through. The path is from a power sources negative terminal, through the various components and on to the positive terminal.

Think of it as a circle.

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Ohms Law

“The amount of current flowing in a circuit made up of pure resistances is directly proportional to the electromotive forces impressed on the circuit and inversely proportional to the total resistance of the circuit.”

(Voltage ÷ Current = Resistance)


I came to a conclusion that the decrease in current is the increase in resistance this is because the current although less of it they collide with the resistance causing a decrease in the output voltage.


The experiment proved to be a success and it went very well although it could be improved by trying other lengths, different voltages but also a different type of wire to be able to compare the resistance difference this would make a more interesting experiment

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

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