Joule's Calorimeter
Product Code : EL-H-10401
Quick answer: Joule's Calorimeter is used to study the heating effect of an electric current and verify Joule's law, H = I^2 R t. A coil inside a 5 x 7.5 cm copper calorimeter is connected to two terminals, and the vessel sits in a polished wooden jacket with a bakelite top. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Calorimeter | Copper, 5 x 7.5 cm |
| Outer vessel | Well-polished wood |
| Top | Bakelite, with holes for thermometer and stirrer |
| Heating circuit | Coil of wire connected to two terminals |
| Variants | Customised calorimeter size; version without wooden outer vessel |
How the Joule's law experiment is done
When a current I flows through a resistance R for a time t, the heat produced is H = I^2 R t, or V I t. In Joule's calorimeter the coil sits in a known mass of water inside the copper calorimeter, and the heat it releases is found from the temperature rise of the water and the calorimeter. The wooden outer vessel reduces heat exchange with the room.
- Weigh the empty copper calorimeter, then fill it about two-thirds with water and weigh again.
- Place it in the wooden vessel, fit the bakelite top, and insert a thermometer and stirrer through the holes.
- Connect the terminals to a DC supply through an ammeter, rheostat and key, with a voltmeter across the coil.
- Note the starting temperature, pass a steady current for a timed interval while stirring, and record V, I and the final temperature.
- Repeat with different currents to show that the heat produced is proportional to I^2.
From the readings, V I t = (m1 c1 + m2 c2)(T2 - T1), where m1 and c1 refer to the water and m2 and c2 to the copper. The same data give the electrical equivalent of heat, close to 4.2 J per calorie.
Key features
- Copper calorimeter, 5 x 7.5 cm, with a current-carrying coil
- Two terminals for connecting the heating coil to the circuit
- Bakelite top with holes for a thermometer and a stirrer
- Well-polished wooden outer vessel to reduce heat loss
- Available in a customised calorimeter size or without the wooden outer vessel
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Joule's Calorimeter at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat products
- Lee's and Charlton's Apparatus (EL-H-10400)
- Callendar and Barne's Apparatus (Continuous Flow) (EL-H-10402)
- Searle's Thermal Conductivity Apparatus (EL-H-10399)
- Constant Level Tank (EL-H-10403)
- Linear Expansion Apparatus (EL-H-10398)
- Joule's Mechanical Heat Experiment Apparatus (EL-H-10404)
The full range is in the Heat section of the Physics Lab range.
Frequently asked questions
What does Joule's calorimeter measure?
The heating effect of an electric current. It is used to verify Joule's law of heating, H = I^2 R t, and to find the electrical equivalent of heat.
Can the calorimeter size be changed?
Yes. A customised copper calorimeter size can be made, and a version without the wooden outer vessel is also available.
What is the price of the Joule's Calorimeter?
Prices are not published on the website. Add the Joule's Calorimeter to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-H-10401 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Joule's Calorimeter?
Yes. Lab Exports manufactures the Joule's Calorimeter at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-H-10401.
Request a quote
Email [email protected] with the house code EL-H-10401 and the quantity, or add the Joule's Calorimeter to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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