physics lab 8

Heat output can determine the electrical energy e

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heat output, can determine the electrical energy (E) over a given temperature difference, found with a temperature sensor in the water. With this value set equal to that of the energy gained by the water over given temperature change (Q), the quotient of these is the electrical equivalent of heat. This can be calculated using the following equation: J = E/Q. (1) The heat of the resistor can be measured as energy given by this formula: (2) Where t is the time during which the resistor has current running through it and P is the power, which is also given by the equation: (3) Where V is the voltage and I is the current running through the resistor. The next thing to look at is the energy gained by the water. The energy gained by water through heat is given by the formula: (4) Where m is the mass of the water, c is the specific heat of water (1 cal/gC), and T is the change in temperature. Then, in order to compare the conservation of energy, divide the energy from the resistor by the energy gained by the water to find out the specific heat of water. Then compare that value to the accepted value in order to see if energy truly is conserved. Equipment: 1. Science Workshop Interface 2. Power Amplifier 3. Stainless Steel Temperature Sensor 4. Gram Scale 5. Patch Cords 6. Resistor to heat water 7. Styrofoam cup 8. Calorimeter 9. Water

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Procedure: Start by opening up the Science Workshop Interface program on the computer.
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