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Heating effects of a current

Extracts from this document...

Introduction

Heating effects of a current

Aim- My aim is to see how the increase and decrease of the current effects the temperature of the water

Equipment List-    

  • Wires
  • Beaker
  • Water
  • Variable Resistor
  • Power Pack
  • Ammeter
  • Crocodile Clips
  • Thermometer
  • Goggles

Fair Test- I will use an equal quantity of water each time. I will make sure the equipment is working properly. I will start the experiment at the same temperature every time.

Pre Test- I am going to do a pre test to decide what voltage to use in the experiment. I will try 4 volts, 6 volts, 8 volts and 10 volts. The voltage was most effective at 10 volts because that’s were the temperature rose the most.

Method- I will gather the equipment on my list. Connect the equipment together making sure it is set up in parallel. I will fill the beaker with a 100ml of water and put the wire into it. I will then switch on the experiment. I will note down the starting temperature and the amp reading. I will then finish after 10 minutes, noting down the temperature. I will then figure out the temperature change. Then I will strengthen the variable resistor and do the procedure. I will do the experiment with the variable resistor at 5 different levels.

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Middle

1.4

22

24

2

1.6

22

26

3

1.8

22

27

5

2.0

22

29

7

Current (amps)

Starting Temperature(°C)

Finishing Temperature(°C)

Overall temperature Change(°C)

1.2

22

23

1

1.4

22

24

2

1.6

22

24

2

1.8

22

25

3

2.0

22

27

5

Average results

Current (amps)

Starting Temperature(°C)

Finishing Temperature(

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Conclusion

°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.

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