The evidence shows that as I predicted that the larger the current the more the temperature will rise. It also shows that the higher the resistance the more the temperature rose. I no this because the ammeter is set up in parallel to the resistor so if the current is higher on the ammeter then it must mean there is less current flowing through the resistor. This also means the current is flowing into the water.
My graph shows that the more the current increases the more the overall change in temperature changes. I conclude that the current has an effect on the heat of the wire. Its effect causes the wire to heat up slowly. This is because when the current is flowing, electrons collide creating friction and therefore heat. This results in the wire heating up. I know this because when the current was in the water it slowly heated up when the current was off the water it did not heat up. I also conclude that the higher the current the more the wire heats up. This happens because the larger the current, the quicker the electrons move and therefore collide more. The more they collide the more friction is made so the more heat is made. My evidence shows this because at 1.2amps the temperature only rose 1°C. At 2.0amps the temperature rose 6°C. This backs up my prediction because in my prediction I said the higher the current, the more the temperature would increase and as I said above that happened. I also can conclude that the more resistance on the variable resistor the more the wire heats up. This is because if the resistance was low like at 1.2amps the electrons mainly flow through the series part of the circuit threw the variable resistor because it is a quicker route. When the resistance was high like at 2.0 it is difficult for the electrons to pass through the variable resistor so they go through the parallel part of the circuit passing through the wire in the water making it heat up more. That is why at 1.2amps where the resistance was low the water did not heat up that much and at 2.0amps where the resistance was high the water temperature increased by a greater amount. That also backs up my prediction because I said the higher the resistance the more the wire would heat up.
The evidence I obtained was quite as I expected because it proved my prediction right because as I said as the current went up so would the temperature. It also helps me conclude that the more current, then the more heat and the more resistance the more heat. I feel the evidence is quite reliable because I repeated the experiment twice and got the around the same results. In my results every 0.2 amps the current went up, the overall temperature rise, went up by 1°C, apart from when I got to 2.0 amps were it rose by 2°C, that is my only anomaly but it is only a small one. I think the procedure proved the point I was trying to make. Although it would have worked better if we had a higher voltage because the current would have been higher and therefore the electrodes would collide more and create more heat. This would therefore show me if it was definitely the current in the wire that was heating the water because it would have been a more major temperature rise. The problem with the way we did it was that the current wasn’t that high so the temperature only rose a couple of degrees and that could have been to do with some other form of heating e.g. the room temperature rising or it being in sunlight. Further work I could provide to provide additional relevant evidence is to get a more powerful power pack and do the same experiment but at a higher voltage therefore making the current higher. This could show me if it is actually the wire heating the water and not another form of heat. Also it would show me if the temperature continued to rise in the same way in comparison to the current as it does in my graph or if it rises less or more.