Experiment 14 ELECTRICAL METHOD: MECHANICAL EQUIVALENT OF HEAT EQUIPMENT Electri
ID: 2077057 • Letter: E
Question
Experiment 14 ELECTRICAL METHOD: MECHANICAL EQUIVALENT OF HEAT EQUIPMENT Electrical Calorimeter Heater and Stirrer Calorimeter Cup Ammeter and Voltmeter DC Power Supply Stopwatch, Thermometer Lead Wires (5) Figure: Photo: Experimental Setup. Insert: Circuit Diagram OBJECTIVE Upon completion of this lab, you will be able to determine the conversion factor, mechanical equivalent of heat Ku, between the mechanical energy (in units of joules) and energy in the form of heat (in units of calories). Upon completion of this experiment you will be familiar with a basic electric circuit and some of the units used in those circuits. CONCEPTS Whenever an electric current flows through a resistive material, a part of the electrical energy will convert to heat. The electrical energy is measured with a unit of joule inExplanation / Answer
solving first 4 Qs only---
1) we get the relation W (electrical energy) is equal to J into Q, where J is the proportionality constant, called the electrical equivalent of heat or Joule’s constant. W = JQ => J = W/Q
J = 4.186 J per Calorie
2)
Electric current in Amperes and potential diffeerence (voltage ) in Volts
3)
“heat capacity” (having a symbol “C”), it is actually the heat needed for a substance’s temperature to change by one degree. It is expressed as the ratio of Joules (symbol “J” which stands for the value for energy) to Kelvin (symbol “K” which stands for the value of absolute temperature) C = J / K.
“specific heat” sounds similar to heat capacity in terms of definition, but the former refers to the needed heat to adjust the temperature of a single unit of a substance’s mass by one degree. It makes use of energy / mass / degree units. C = J / kg . K.
4)
Power P = VI = 10 x 3 = 30 W
Energy= P x t= 30 x 15 x60 = 27000J
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