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PHY 201 - Lab03 - The Electrical Equivalent of Heat

# PHY 201 - Lab03 - The Electrical Equivalent of Heat - II...

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II. Introduction This lab objective is to show how the concept of heat energy relates to electrical energy. It furthers the understanding of calorimeter through measuring the electrical energy and calculating the Joule equivalent of electrical energy. This will be done be measuring the heat emits by a lamp in dark water surrounds by a Styrofoam. III. Theory and Method of Investigation The Joule equivalent of heat (J), discovered by Sir James Joule while studying the laws of mechanics, electricity and magnetism; is the amount of mechanical or electrical energy within a unit of heat energy. The amount of electrical energy expanded over time is known as Power. The energy Electrical and mechanical energy in an electrical circuit are measure in units of joules, but heat energy uses the measurement units of kilocalories. The change in the heat energy of a material is directly proportional to the change in temperature of the material which also depend on the material and its specific heat. The transfer of electrical energy to heat energy equals If A constant current flowing through a resistive heating element, produces a constant potential drop V across the element. This potential energy expanded into heat energy increases its container and its constituents’ temperature. Therefore, the change in heat energy of the container and water will be the sum of the heat energies of each as shown in the equation below.

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PHY 201 - Lab03 - The Electrical Equivalent of Heat - II...

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