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How Efficient is an Immersion Heater

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How Efficient is an Immersion Heater by Ryan Ginty Introduction Aim The aim of my experiment is to find out how efficient an immersion heater is using the formula: Efficiency=Energy Out (heat) Energy In (electricity) Factors The factors that affect the efficiency of an immersion heater are; 1. Thickness of Wire 2. Length of Wire 3. Volume of Water 4. Voltage Supplied I will be changing the Length of Wire and the Voltage supplied because they are both very closely linked with the resistance of the heater. The amount of energy that is turned into heat energy is measured through the heaters resistance, so I can work out how efficient the heater is. ...read more.


As the Electrons collide with the atoms they cause them to vibrate faster producing heat. So if the wire is longer the Electrons are more likely to collide with the atoms, and make the resistor hotter, thus the longer the wire the greater the resistance. I predict that as I double the length of the wire the resistance will double. This is because the Wire is twice as long resulting in double the amount of collisions. (Reference source Physics matters) Prediction 2 I predict that as the Voltage increases the resistance will increase. This is because the electrons (see Fig 1) ...read more.


I will pour out 70ml of water into the measuring cylinder, I will measure to 1dp to insure a fair test. The water will then be poured into the beaker. I will then place the Immersion heater and the thermometer into the beaker. In the interests of reliable and accurate evidence I will be using the same equipment for all experiment's. I will then switch the power pack on and start the stopwatch. I will be measuring the temperature every minute and check twice to make sure that the data is accurate. I will change the water every timeand make sure it is the same as the previous runs. I will change the variable factor every three runs of the experiment. Results 1st variable Length 20cm Length 80cm Length 30cm Length 50cm Conclusion ...read more.

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