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INVESTIGATION INTO THE EFFICIE


             Finally I will use a polystyrene cup as the container. Polystyrene is also a very good insulator. As it is so light I will be able to ignore the amount of energy used to heat it, when calculating the efficiency. This experiment using a polystyrene cup should give me the most accurate value for the efficiency although it will not be completely accurate as heat will still be lost through the air gaps and container. .
             From previous research I know that: .
             The equation I will need to calculate the total energy imputed is:.
             E = PT .
             Energy (J) = power (W) X time (s).
             The equation I will need to calculate the amount of energy used to produce a temperature change is:.
             E = MCq.
             Energy (J) = mass(kg) X specific heat capacity of medium (J/kg/oc) X temp change (oc).
             To ensure a fair test, in each experiment I will use a 24w light bulb and only change the form of insulation/container between experiments. All other factors will remain a constant. .
             PREDICTION.
             From previous research I know that the actual efficiency of a standard 24watt light bulb is about 20%. I also believe that as I improve the insulation the value of the efficiency will become less, as less heat is being loss. Due to the apparatus I am working using and experimental error caused by uncontrollable lost heat I believe that I will achieve a final result between 25% - 35%.
             EXPERIMENTAL TEST.
             1) Apparatus.
             The apparatus that used was:.
             Power pack.
             Power cables.
             24watt light bulb.
             Water.
             250ml glass beaker.
             Polystyrene cup.
             Bubble wrap.
             Thermometer.
             2) Method.
             Attach power pack and cables to bulb.
             Set power pack to 12v.
             Weigh beaker.
             Suspend bulb in beaker.
             Fill beaker with water until bulb is submerged up to 1cm from base of bulb.
             Remove bulb weigh water and beaker together.
             Re submerge bulb.
             Measure temperature of water.
             Turn on bulb.
             Measure temperature of water every minute for 10minutes.
             Repeat experiment as necessary to obtain more accurate average.
             3) Diagram of Experiment.


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