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

The aim of our investigation is to investigate Ohms Law.

Extracts from this document...


Siobhan HigginsG.C.S.E Science Coursework



The aim of our investigation is to investigate Ohms Law.


In my investigation I am trying to prove that Ohm’s law works.  Ohm’s law is used to find a value in a missing circuit.  Georg Ohm, a German physicist proved that resistance is equal to voltage divided by current.  Resistance is the difficulty in getting the current round the circuit.  I will test the resistance of different lengths of nichrome wire.



Prediction and Hypothesis

        I predict that the wider apart the crocodile clips are, the higher the resistance is.  I know this as the longer the wire, the more free electrons there are, which means more collisions, which results in higher heat loss.


To make the

...read more.


- Switch the power pack on and record the voltage and current

Step 4- Turn the power pack off and move the crocodile clip to 90cm

Step 5- Turn the power pack back on and record the Voltage and Current for 90cm

Step 6- Repeat this for 80cm, 70cm, 60cm, 50cm and 40cm.

Step 7- Repeat this process four more times to make the test fair

Step 8

...read more.


Graph of results
Discussion of results

On the length/resistance graph I can see that the higher the length, the more potential difference there is in the circuit.  The points of the graph are plotted in a straight line, and there looks to be roughly the same amount space between each point.

On the length/ current graph I can see that the longer the length, the smaller the current becomes.  The points are plotted roughly the same amount of distance away from each other, and have a slight curve to the line.

On the length/voltage graph I can see that the points are very close together and do not have a lot of variation.  The longer the length, the higher the voltage becomes, however the voltage does not increase by a lot.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics 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 AS and A Level Electrical & Thermal Physics essays

  1. To prove ohms' law, and to study the relationship between current and potential difference ...

    Therefore the current (I) was the least, as Resistance is inversely proportional to current. Where the ammeter read 0.18A, and the voltmeter read 2.18 volts. Then I gradually increased the resistance by pulling the handle of the variable resistor towards me, thus decreasing the resistance, and increasing both the current and the voltage.

  2. The varying of the resistance of nichrome wire depending on its length

    2. Keep the dial on the alternating current power pack at 1. 3. Press switch and take readings of both voltmeter and ammeter. 4. Turn the dial up in one's always taking the readings at each number. 5. Record all results and turn power pack off.

  1. Investigating Ohms law

    There are four factors that affect resistance as I mentioned above. Now I will say how they affect resistance. 1) Length: Resistance is proportional to the length of the wire, meaning as the length of the wire increases, the resistance also increases.

  2. Investigating the effect of 'length' on the resistance of a wire

    experiment, recording the results in table and then drawing graphs, that resistance I directly proportional to the length of the wire meaning that an increase in length would consequently lead to an increase in resistance. As most of the points in graph No2 lie on the line of best fit,

  1. The aim of my investigation is to determine the specific heat capacity of aluminium.

    * Once the aluminium has cooled, to check whether the temperature is cool enough for the object to be moved use the back of your hand. * Be careful with the electrics. After my trial run and analysing my results it was clear that the insulation around the aluminium was

  2. physics sensor coursework

    To improve its reliability, I should test it at several more locations, preferably with different values of light intensity. The reliability of the results could be further improved if the external factors such as temperature could be more strongly controlled.

  1. A2 Viscosity investigation

    high errors on these could be down to a number of reasons over all I feel that temperature will have affected the results the most as it was the least accurate measurement made. For example the 20�C result has an error value of more than a quarter of the value

  2. resistivity if a nichrome wire

    (Fig 1) Circuit diagram (Fig 2) Background knowledge Resistance is a measure of a component's ability to an electric current through it. It is the resistance of a material of cubic shape of length of one meter Good conductors of electricity have low resistance as current is able to pass through the component and poor conductors have high resistance, as there is no current flow.

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