University the Wisconsin-Stevens suggest > CNR associated Programs > Wisconsin K-12 Energy education and learning Program > energy Education: Concepts and also Practices > ar B: energy Transfer
​ Unit 2: Energy Rules!

Section B. Power Transfer

Energy Transfer

The 2 ways that power can be transferred are by doing work and also by warm transfer.

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Doing Work 

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Energy have the right to be moved from one thing to an additional by law work. To do job-related requires the an agent exert a force on an object over a distance. When work-related is done, power is transferred from the agent to the object, which results in a change in the object's movement (more specifically, a adjust in the object's kinetic energy). 

An example of just how Doing job-related Transfers energy from One thing to Another

Suppose that a human being (the agent) exerts a force on a wheelbarrow (the object) that is initially at rest, bring about it to move over a certain distance. Recall that the work-related done top top the wheelbarrow by the human is same to the product that the person's pressure multiplied by the distance traveled through the wheelbarrow. Notification that as soon as the pressure is exerted on the wheelbarrow, there's a adjust in that motion. The kinetic energy increases. But where walk the wheelbarrow acquire its kinetic energy? It came from the person exerting the force, who offered chemical power stored in the food lock ate to move the wheelbarrow. In various other words, as soon as the human did work-related on the wheelbarrow, they transferred a specific amount that chemical energy to the wheelbarrow, resulting in it to move. As a result, the person's store of chemical energy decreases and also the wheelbarrow's kinetic energy increases.

Heat Transfer 

Heat is the transfer of energy from a warmer thing to a cooler object. For example, a lighted match (higher temperature object) will transfer heat to a large pan filled v lukewarm water (lower temperature object). Note that the actual lot of thermal power each object has actually doesn't matter, together the pan of lukewarm water might have more thermal power than the match. What is required for heat transfer to take place is a difference in temperature between two objects. There is no this difference, no heat transfer deserve to take place.

Heat have the right to be transferred in three ways: by conduction, by convection, and by radiation.

Conduction is the move of energy from one molecule to an additional by direct contact. This transport occurs as soon as molecules hit versus each other, similar to a video game of pool where one moving ball strikes another, bring about the second to move. Conduction takes ar in solids, liquids, and gases, however works ideal in products that have straightforward molecules the are located close to each other. For example, metal is a far better conductor than wood or plastic.

Convection is the activity of heat by a liquid such as water or air. The liquid (liquid or gas) moves from one location to another, carrying heat together with it. This motion of a mass of boil water or waiting is dubbed a current.

Radiation is the transport of heat by electromagnetic waves. When you stand in the sun, you space warmed by the electromagnetic waves, mainly infrared radiation (and to a lesser extent, visible light), that travels from the sun to Earth. In addition to the sun, irradiate bulbs, irons, and toasters likewise transfer heat via radiation. Keep in mind that, unlike conduction or convection, heat transfer by radiation does no need any matter to help with the transfer.

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You have the right to detect evidence of warm transfer. You could see the waiting shimmering end a radiator (convection), placed your hand top top a heat spoon that's to be sitting in a warm bowl that soup (conduction), or notice that the sunlight shine feels warmth on her skin (radiation). If girlfriend need proof of thermal energy or heat in her life, simply feel your arm. Your body generates warm 24 hrs a day! (Taken from KEEP energy Education task Guide "Exploring Heat").