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Measuring Electrical Energy

The word ‘energy’ reflects movement, force, and change. The famous law of conservation of energy also states that energy is neither created, nor destroyed, but it changes from one form to another. There are different forms of energy such as mechanical, chemical, thermal, nuclear, electromagnetic, etc. Even the kinetic energy (of movement), potential energy (of position), external and internal energy in thermodynamics, and relativity theory confirm this rule. In other words, energy is nothing but transformation, conversion or movement of one form to another such as motion, heat or light.

The energy can be measured, but as the form changes, the measuring unit also changes according to the form of the particular energy. Measuring electrical energy requires Voltage unit. Voltage is the difference between two conductors in the electrical potential. It is the measure of electrical energy when the electrons move between two conductors. The voltage can be upper or lower in the range. The electricity is transmitted at high-voltage for longer distances, while lower voltage is sufficient to power the home or business. However, voltage is an electrical quantity which is meant for its basic unit that is watt, absorbed or produced by an electric circuit. In scientific term, Voltage is denoted as V, current as I, and Watt as P. We know that heaters and electric bulbs absorb energy, while generators and batteries produce energy. Higher the absorption or production of electrical energy, greater is the consumption or transmission of load of energy.

Electrical energy that we use in our homes and offices is measured by electricity meter in kilowatt-hours for which we pay. If we switch on an electrical equipment which rated at 1000 watts and kept it on for an hour usage, we have used 1kWh of electricity. This means that a 100 watt electric bulb is switched on for 10 hours, the total usage of the bulb will be 1kWh. Electrical equipments have power rating in watts. The various types of factory machinery and domestic electric appliances like fridge, washing machine, heater, oven, fan, cooler, television, computer, and drier also possess energy efficiency that denotes their electrical energy usage and cost. For efficient energy, the rating is “A”, while fewer efficient energy rating is “G”. In other words, greater the energy efficient device, lesser the energy will be consumed. Evidently, it is energy-saving and money-saving. Needless to say, you will contribute to save the environment and be eco-friendly.

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