6. Enter all your data and the results of calculations in the data tables below. Data Table Item Amount Item Amount Item Amount Water Vol. Initial temp. T,- Voltage v V Water mass m Final temp. TJr Current I Temp. change Power a T P Time I Item Amount Electrical Energy. E: Pt Thermal Energy, (22 cm A T Electrical Equivalent of Heat E.E. H: ElectricolEnergz Thermal Energy Note: Most likely your experimental value of E.E.H. will be close but not precisely equal to the accepted value. It happens because of the limited accuracy of the current and temperature readings in this virtual experiment. Let designers of this simulation to worry about that. It's not your fault. Questions: 1. Based on your data, what is the resistance of the resistor used in this virtual experiment? 2. In this experiment. it was assumed that all dissipated electric energy was absorbed by the water and converted into the thermal energy of water. If part of the electric energy was lost into surroundings {heating for example. the air in the room and the beaker} will your experimental value of E.E.H. increase, decrease, or stay the same? Explain your answer. Procedure Physics Simulations: Electrical Equivalent of Heat Lab https://www.thephysicsaviary.com/Physics/Programs/Labs/ElectricalEquivalentOfHeatLab/index.html Electrical Equivalent of Heat Lab Time 3 s CH 1: TEMPERATURE Vemie In real life the beaker would be swirled 14.3 .C to keep the temperature of the water uniform. Feel free to turn off the power supply when you are ready to take data. 212 ML L Enfant Corp. DC Power Supply 20 v Current ( A) 212 mL L'Enfant Corp. DC Power Supply 20 v Current (A) Precision Meter POWER Made Germany Click on the control white knobs Click on the beaker to Ammeter to change the voltage change (Ampere Meter) the volume of water V 1. Find the mass of water in grams as m=pv where v is the water volume (in ml) and p=1g/ml is the water density. 2. Record the initial water temperature T; . Click on the Power switch to turn it on and heat the water until its temperature increases by approximately 10Co . Record the voltage V and the current I . 4. Turn the Power switch off and record the final water temperature T and the time of the experiment t . 5. Calculate the electric energy E and the thermal energy Q and find your experimental value of E.E.H.Experiment 5: Electrical Equivalent of Heat The purpose of this activity is to explore conversion of the electric energy dissipated by a resistor into the thermal energy absorbed by the water. This concept is known as Joule Heating. Comparing the amount of the electric energy dissipated in the resistor with the amount of the thermal energy absorbed by the water we can find the electrical equivalent of heat from the law of conservation of energy. The electrical equivalent of heat is the number of joules of electric energy that are equivalent to one calorie of thermal energy. Theory If there are no energy losses to the surroundings, all the electric energy given off by the resistor should be absorbed by the water. The electric energy, E , dissipated by the resistor is E = Pt where t is the time during which the current flows through the resistor and P is the electric power determined as P =IV where I is the current through the resistor and V is the voltage across the resistor. If the current is measured in amperes, the voltage is measured in volts, and the time is measured in seconds the calculated electric energy E is measured in joules. The thermal energy, Q , gained by the water is determined as Q=cmAT where m is the mass of the water, c is the specific heat of water (1 cal/g 'C), and AT is the change of the water temperature. If the mass is measured in grams and temperature is measured Celsius degrees the calculated thermal energy Q is measured in calories. It follows from the law of conservation of energy that E joules )=Q (calories) The last equation allows us to find how many joules are equivalent to 1 calorie or the so-called electrical equivalent of heat (E.E.H.) as E. E. H. =- E joules) Q calories This number establishes very important relationship between two different units used to measure the energy: joules and calories. Accepted value for this relationship is 1 cal=4.184J