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Is it true that every time energy changes form some of it is given off as unusable?
Wiki User
∙ 11y ago
In almost all energy conversions, a portion of the energy is wasted. Always remember that energy is never lost but is converted to a form that is of no use in the application.
For example, an electric motor uses electrical energy to rotate but a portion of the electrical energy is converted to heat - it's wasted because heat doesn't help the motor to rotate but it's still a form of energy.
A different example, that of a car engine. Energy that is released by the chemical reaction of burning gas is used to move the car forward. A significant amount of the energy is changed to heat. That is obvious when you feel the engine getting warm as it runs. The heat is mostly unusable so it is wasted.
In most energy conversions, a proportion if the energy turns to heat so rarely is there a conversion that is 100% efficient. An exception is an electric heater. In this case, all the electrical energy that is delivered to the heater is turned into heat. What would be wasted energy in other applications is all useful so it can be considered to be 100% efficient.
Wiki User
∙ 11y ago
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Is it possible to entirely convert a given amount of heat into mechanical energy?
No. In heat energy, there is always a certain amount of unusable energy. What amount depends on the availability of colder objects.
What happens to an electron if it is given energy?
An electron emits energy in the form of an x-ray (a photon) when its energy level in the electron cloud decreases as a result of reduction in the excitation level of the cloud. This means that the position of the electron in the cloud changes to a lower level.
When gas changes into liquid heat is taken in or given out?
Heat is given out.
Does the inertia of an object of an object change as its velocity changes?
No. Intertia is a measure of how easily an object's speed can be changed. So if it takes a certain amount of force or energy to speed an object up to a given speed, it'll take the same force/energy to slow it down to zero again, or it'll take the same energy to double its speed from that given level. Hope that makes sense.
What kind of energy are given out by a candle?
heat energy
Is it true that every time changes form some of it is given off as unusable heat?
Yes. There is hardly a process that is 100% efficient.
What is an increased entropy?
In short, it is an increase in two things within a given system. 1. increase in disorder 2. increase in the % of unusable energy
When does entropy increases?
Entropy increases when ever energy is used up. Energy cannot be destroyed, but it is always lost in the form of unusable energy. Entropy is the % of unusable energy compared to usable energy in a given system.
Is it possible to entirely convert a given amount of heat into mechanical energy?
No. In heat energy, there is always a certain amount of unusable energy. What amount depends on the availability of colder objects.
What is fluxdensity?
the number of changes in energy flow across a given surface per unit area
What is given and received from the process when matter changes from one state to another?
Energy is lost or gained.
What is given off in all energy changes?
energy is released which makes it hotter because it is an exothermic reaction, or energy is absorbed which makes it colder and an endothermic reaction =]
What two kinds of energy changes can take place during a chemical reaction?
Two types of energy changes that can occur in a chemical reaction are (1) endothermic and (2) exothermic. Endothermic is where energy is added to the system and exothermic is where energy is given off by the system.
What is released as one form of energy changes to another form?
Energy. Given that energy can be neither created nor destroyed, the total energy output equals that input, and in a system the ratio of that output energy desired to the total input gives the efficiency.
Changes in which no new kinds of matter are produced is called?
A chemical change. Chemical changes can also be indicated if energy is given off. Physical changes on the other hand do not produce energy or produce new substances.
How would you compare the formation of positive ions with the formation of negative ions in terms of energy changes?
when a negative ion forms electrons are gained and energy is given off and when a positive ion forms electrons are lost and energy is used.
Organelle that transforms unusable energy in food molecules into a usable form?
Mitochondria are the organelles responsible for metabolizing food molecules and storing the energy given off by converting ADP to ATP, the universal energy vehicle of living things. ADP (Adenosine DiPhosphate) ATP (Adenosine TriPhosphate)
