Sometimes a bigger unit namely kilocalorie is used. The SI unit of power is the watt (W), which is equal to one joule per second. The unit of heat is calorie, British thermal unit (B.Th.U.) and centigrade heat units (C.H.U.) on the various systems.Ĭaloric: It is the amount of heat required to raise the temperature of 1 gm of water through 1☌ Unit of power Kilojoule/hours The units of power are the units of energy divided by time. Heat is a form of energy which produces the sensation of warmth. In practice, for the measurement of electrical energy, bigger units viz., watt-hour and kilowatt hour are used.ġ kilowatt hour (kWh) = 1 kW x 1 hr = 1000 watt x 3600 sec = 36 x 10 5 watt-sec. Joule or watt-sec is a very small unit of electrical energy for practical purposes. of 1 volt exists between them and 1 ampere current passes between them for 1 second i.e.,Įlectrical energy in watt-sec (or joules) = voltage in volts x current in amperes x time in seconds One watt-second (or joule) energy is transferred between two points if a p.d. The unit of electrical energy is watt-sec or joule and is defined as follows: So, if the person in the above example applies. Therefore, the unit of power is joules per second, which is known as the watt (W). Mechanical energy in joules = Force in newton x distance in meters 2. The unit of work is the joule (J) and the unit for time is seconds.
For your reference, in the table below we have provided the SI unit of energy and power. The work done on a body is one newton-metre (or joule) if a force of one newton moves it through a distance of one metre i.e., The SI unit recognized for measurement of force is Newton. The unit of mechanical energy is newton-metre or joule on the M.K.S. However, it must be realized that since mechanical, electrical and thermal energies are interchangeable, it is possible to assign the same unit to them. Different units have been assigned to various forms of energy.
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