Joule

Joule

• Joule is the international unit of energy or work. 
• The symbol is the Latin capital letter J.
• Formula
• 1J = 1 N*m
• 1 joule is the energy required for or work done when an object is moved one meter with a force of one Newton
• Orgin
• James Prescott Joule
• British physicist and brewer
• One of the discoverers of the law of conservation of energy.
• c.f., the law of conservation of energy
• Energy can only change its form or transfer to another, but cannot be created or lost.
• e.g., In roller coasters, potential energy due to gravity is converted into kinetic energy, or chemical energy of gunpowder is converted into kinetic energy of bullets.