Apparatus to demonstrate Joule's law, 19th-20th century.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Apparatus to demonstrate Joule's law, 19th-20th century.

© Science Museum / Science & Society Picture Library

Description

James Prescott Joule (1818-1889) is responsible for the experimental establishment of the mechanical theory of heat. Joule's law states that the heat (Q) produced when an electric current (i) flows through a resistance (R) for a time (t) is given by Q = R x t x i squared. An electric current flowing through a high-resistance wire heats the wire which warms the water. The temperature rise of the water over a certain time, compared to the electric current pased through the wire, shows the relationship between the two.
 

Image Ref.

10326270
 

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