Concepts of energy and tension are crossed only in one section of physics "Electricity", however their interrelation is various in dependence about what phenomenon is considered.
Instruction
1. Open the head "Electricity" in the textbook in physics. The first what consideration of the electric phenomena begins with - it is a charge. The charge is a source of electric field. And the heteronymic charges located at some distance from each other are a source of tension which change is considered here. So, tension is a potential difference between two points of electric field. Potential of electric field is the electric field strength increased by distance from a charge source of this field to this point.
2. Thus, the potential of electric field of a charge is directly proportional to the charge creating this field and is inversely proportional to distance from a consideration point to the charge. It is worth noticing that in this case everything is considered for model of a dot charge. Carrying charges on long distances from each other, it is possible to reduce energy of interaction of these charges. But working thus, the potential difference between charges, that is tension actually decreases. Means, at reduction of tension also energy of interaction of charges decreases.
3. To understand what exact dependence of energy of electric field on tension, glance "Electricity" of the textbook of physics in the Electric Capacity paragraph of chapter. Obvious communication of energy of the field with tension is given in the context of consideration of electric field of the loaded plane-parallel plates. Such plates form electric field which you can represent the horizontal beams directed from one plate to another. The energy of such field reserved by the condenser depends on condenser capacity parameter and also on tension given on the condenser. And this energy quadratically depends on tension on the condenser. Thus, increasing tension, it is possible to increase energy of the field in a bigger degree.
4. Pay attention that is frequent, speaking about interrelation of energy with tension, mean the energy disseminated on a resistive element that is thermal energy. From the law of Joule Lenz it is known that this energy is directly proportional to tension on an element, to force of the current passing through an element and time for which this energy dissipates. Applying the law of Ohm and substituting from it value of current in expression for energy, it is possible to receive that thermal energy is equal to the relation of the work of a square of tension on an element for a while to resistance of a resistive element. Thus, it is again possible to see that at reduction of tension on an element, say, twice energy will decrease four times.