Apparatus
In this experiment I will need; a light bulb, a light bulb holder, a battery pack, four crocodile clips, an ammeter, a power supply, a piece of putty and four wires. I will need the light bulb to show if the circuit is complete. The battery pack is control the electrical currant and the crocodile clip and wire to carry the currant.
Safety
The first danger is the power of the electrical currant. To prevent any danger of electrical shocks I will use the battery pack to control the strength of the currant and turn it down to four cells. The power will be DC (direct currant) and the putty used will be on a non-conductive surface.
What factors could affect what happens
There are two obvious factors what come to mind and that is inaccurate measuring and uneven amount of putty. I will have to be careful with the measuring of the putty and the amount removed each time.
What I am going to change
In the experiment I am going to keep the putty’s diameter the same but change the length each time and record the amps with each reduction in the putty.
What I will measure in
I plan to measure the putties length and diameter in centimetres and the currant in amps.
What factors I am going to keep the same
In the experiment I am going to keep a few things the same such as the diameter of the putty, the amount of cells and all of the safety procedures.
Repeats of the experiment
I plan to make a repeat the experiment and make an average of the results if I have time to repeat.
How I plan to set up my equipment
How many measurements I will take
I plan to do the results in even numbers but I am not sure what number of measurements due to the fact I don’t know what amount of putty I will be given.
Method
- First I will set up the circuit to match the planned diagram and make sure all of the equipment is working properly. And also set the power pack to four cells.
- Now I will chose the largest length of putty and add it to the circuit.
- I will now record the reading on the ammeter and turn the power off.
- I will then repeat the experiment but remove a piece of putty each time and record each result.
Did anything strange happen
After the experiment I didn’t have any irregularities in the results or the experiment.
Changes to the original plan
In the experiment I used two 2 pence copper coins at each end of the putty and attached the wire to them.
