Question

Who developed the conversion between mechanical energy and heat.

• A. Celsius.
• B. Kelvin.
• C. Joule.
• D. Newton.
• E. Watt.

Answer 1

Answer: (C)

Joule.

Joule has shown that when mechanical energy (work) is converted into heat , the ratio of work done ($W$) to the heat produced ($Q$) ,is always a constant , given by ,

$W/Q=J$ ,

where $J$ is called Joule's mechanical -heat equivalent , which converts heat into work and vice-versa , and its value is , $J=4.18J/calorie$