# Joule's Experiment and the First Law of Thermodynamics

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Joule's experiment demonstrated the validity of the first law of thermodynamics. Electrical or mechanical energy can be converted into thermal energy, but the total amount of energy is conserved. In this Demonstration, the amount of heat in joules generated in a circuit element of resistance (immersion heater) is measured by a calorimeter. Assume that all the heat is absorbed by the water and measure the temperature increase from to . Then

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Contributed by: Anping Zeng (June 2015)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Snapshot 1: only heating time into 240 s Snapshot 2: only voltage into 4.85 V Snapshot 3: only depth of water into 7.5 cm

## Permanent Citation

"Joule's Experiment and the First Law of Thermodynamics"

http://demonstrations.wolfram.com/JoulesExperimentAndTheFirstLawOfThermodynamics/

Wolfram Demonstrations Project

Published: June 10 2015