Independent Variable- The independent variable would be the reading we get of the ammeter.
Apparatus-
- 5 wires
- 1 filament bulb
- 1 resister
- 1 voltage meter
- 5-10 crocodile clips
- Ammeter
Method-First of all I drew the circuit so that it easier for me when I go to set up all the equipment, than I will to connect what to what. After drawing the circuit I gathered all the apparatus that I need for this experiment. After setting them what I will have to do is connect and wire them up so that the circuit is ready to go. I plan to do my experiment with 5 bulbs to make it fair. However as I can see I don’t think I will have enough time to get it done therefore I will only do it for 2 to 3 bulbs. After taking down the Results for that I drew another circuit which is without the Resister. And started taking down the Results.
Circuit
Result- R=V/I this how I figure out the resistance for this experiment.
1 bulb with a Resister
Data Processing-This is my result over as you can see from the reading of the ammeter, the difference while increasing 1 volt isn’t much. The pattern shows two is amps is added frequently or 1. The brightness level in this experiment wasn’t that exciting as in the bulb lit up only four times, along with that the high brightness it got to was dim. In this experiment as the volts increased the Ammeter readings did too.
1 bulb without a Resister
Data Processing-Over here the result above is quite different from the last one. The Ammeter reading start of higher and it ends up with the bulb bursting too. Over there the patter shows there is a skip of .4 in average of 1 volt increasing. The brightness is a bit strange because when the 1 volt there is no light and at 2 volts the bulb lights up but very dim and then again at 3 volts there is no light. Than it from the point onward from 4 volts it is bright till 8 volts then there was too much pressure and the bulb burst. Over here the result for the resistance is totally out of range.
Analysis- as I observed the result I saw very different pattern. However my hypothesis was right since as you can see in the second table the bulbs did get brighter at the end which is what I predicted. I predicted this due to a scientific reason which is the higher the voltages the more current will flow therefore there will more energy.
Conclusion- as for conclusion I would say the higher the voltage the brighter the bulb gets. However, in our experiment at a point the bulb burst because it could not take anymore.
Evaluation- Like all experiments this experiment had human errors too for example while we took the result of the ammeter it changed, as in there was 1dp difference therefore I would count that as the only human error. Since it did not include a lot of difficult measurements there was no human error. I could have definitely improved on this investigation if I did it with more bulbs than it would clearly show my point. The validity of my result would surely make my results more accurate. If I got the opportunity to do this test again I would perhaps use the mille ammeter which would give me a more detailed accurate reading.