GENERAL KNOWLEDGE

Detailed explanation-1: -The SI unit for energy is the joule (J): 1 J=1 newton metre (N m). Another unit is the calorie (cal), which is defined as the heat required to raise the temperature of 1 g of pure water by 1°C at 1 atm pressure.

Detailed explanation-2: -Basic Units. Joule (J). This is the basic energy unit of the metric system, or in a later more comprehensive formulation, the International System of Units (SI). It is ultimately defined in terms of the meter, kilogram, and second.

Detailed explanation-3: -One joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one meter.

Detailed explanation-4: -The joule (symbol J) is the SI unit of energy-a measure of the capacity to do work or generate heat. One joule equals the work done (or energy expended) by a force of one newton (N) acting over a distance of one meter (m).

Detailed explanation-5: -It will not be uncommon to measure energies in thousands of joules, so the kilojoule (kJ) is a common unit of energy, with 1 kJ equal to 1, 000 J. One area where the calorie is used is in nutrition. Energy contents of foods are often expressed in calories.