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The effect of certain factors on heating of water

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the effect of certain factors on heating of water Planning The purpose of this investigation is to assess the effect of certain factors on heating of water, therefore the variables of my investigation is the relationship between the power supplied to the heater and the temperature increase of a given mass of water being heated at a given time. EQUIPMENT For this experiment the following apparatus was used; 1) A thermometer to measure the temperature of the water 2) A plastic cup. 3) Volt meter to measure the voltage 4) A ametre to measure the current 5) A filament to heat the water 6) A power pack 7) A variable resistor to vary the current. 8) A watch. A plastic cup was weighed empty and the weight was recorded, it was filled with water and weighed again the result was recorded. The difference between the result was the weight of the water. The apparatus was then set up as shown in the sketch 1. The ambient temperature and the temperature of the water were then recorded. Keeping the mass of the water constant a steady current 3.1 amp was then passed through the heater for 1 minutes with a recorded voltage of 6 volt. The temperature of the water was recorded. The water was then thrown away and the experiment was the carried out again but this time the water was heated for 2 minutes. ...read more.


It can also be predicted from the equation that the mass of water being heated is inversely proportional to its temperature difference Equations The following equation taken from books and class notes have been used through out my investigation to assess the relation ship of power and temperature. Power = Energy Time Also Power = Voltage x Current Watts = V x A Energy = Mass x Current x Temperature Change Q = M x A x ?T Therefore Energy = Current x Voltage Time Energy = Current x Voltage x Time Therefore Current x Voltage x Time = Mass x Current x ? Temperature ? Temperature = Timex Current xVoltage Mass x Specific Heat Capacity Therefore since current x voltage = power then ?Temperature is directly proportional to power. From the above equation it can also be predicted that ?Temperature is also proportional to time and inversely proportional to its mass PRODICTIONS From the above equations and our results we can predict both the power and the mass of the water as follow; The specific heat capacity of water is 4200 J/kg K Voltage = 6 V Current = 3.1 A Therefor the Power P = 6 x 3.1 = 18.6 Watts Using the equation ? Temperature = Timex Current xVoltage_____ Mass x Specific Heat Capacity At 1minute the ? Temperature is ? Temperature = 1x 18.1_____ = 18.6 = 0.086 degree 50 x 4.200 210 At 2minute the ? Temperature is ? ...read more.


This is because the apparatus we used did not measure the Power. However I took the measurement of the voltage and current supplied and then used the formula P = VI to find the power. The voltage was then increased by 1V for each time the current recorded. Conclusions By plotting the results obtained as indicated in attached table the graph of time against heat gained was plotted. By drawing the best line through the coordinate, it can be seen that the straight lines passes through the origin. From the graph it can be concluded that if the Power supplied to the heater is increased the temperature will also be increased in proportion. This increase can be calculated by utilizing formula y = mx+c, where y = is the value of temperature and X, is the value of time and m, is the gradient, and c is the point where the line of best fit intersects the y-axis. The gradient of the graph = 7-1 = 2 3 The line intersect at 0 on the y-axis, therefore C = 0. Therefor by substituting the above figures in the equation we can deduce that Y = 2X . From this equation, we can predict the change in temperature change by multiplying the Power supplied by 2. From the above analysis I have conclude that my prediction in the Planning section of the write up have been proved and that if an increase in Power will increase the temperature proportionally, i.e. the variables are directly proportional. TABLES & GRAPHS ...read more.

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