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1) energy is the quantitative property that must be transferred to a body or physical system to perform work on the body, or to heat it. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed
2)The SI unit for energy is the Joule, or J. 1 J = 1 kg·m2/s2. The cgs unit for energy is the erg. 1 erg = 1 g·cm2/s2. ... [Other common units for energy include the electron volt: 1 eV = 1.602 × 10−19 J, the calorie and the Calorie.
3)It will take the same amount of energy: 1 Joule. ... If you use one kilowatt of power for an hour, you have used 1 kilowatt-hour, abbreviated kWh, of energy. One kilowatt-hour is equivalent to the energy of 1,000 joules used for 3,600 seconds or 3.6 million Joules. In equation form: 1 kWh = 3.6 million
4)Joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre. ... In electrical terms, the joule equals one watt-second—i.e., the energy released in one second by a current of one ampere through a resistance of one ohm..
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