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ENERGY, POWER AND VOLTAGE ( ЭНЕРГИЯ, МОЩНОСТЬ И НАПРЯЖЕНИЕ) Exercise 1. Read and translate the text, using the words below. We are going to use the hy
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ENERGY, POWER AND VOLTAGE ( ЭНЕРГИЯ, МОЩНОСТЬ И НАПРЯЖЕНИЕ)
Exercise 1. Read and translate the text, using the words below.
We are going to use the hydraulic analogy again. It takes energy to pump water uphill, and the potential energy of being at a high elevation is released when it descends to a lower elevation. The amount of energy (in joules) is mgh, where m is the mass of liquid (say, in kilograms), g is the strength of gravity (9.8 meters per second squared, or 9.8 newtons per kilogram), and h is the elevation distance. Some elementary physics: The SI unit of energy is the joule, and is one newton-meter, and is the energy required to push something with a force of one newton through a distance of one meter. The unit of force is the newton, and is the force required to increase the speed of a one kilogram object by one meter per second per second. The unit of rate of flow of energy is the watt, and is one joule per second. Note that the watt relates to all of physics, not just electricity.
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