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

### Energy Transfer

The 2 ways that power can be transferred space by act work and by warmth transfer.

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### Doing Work

Energy deserve to be transferred from one object to another by law work. To do work-related requires the an agent exert a force on an object over a distance. When work-related is done, power is moved from the certified dealer to the object, which outcomes in a readjust in the object's activity (more special, a adjust in the object's kinetic energy).

### An instance of how Doing occupational Transfers power from One thing to Another

Suppose the a human (the agent) exerts a force on a wheelbarrow (the object) that is originally at rest, causing it to move over a certain distance. Recall the the work done on the wheelbarrow by the human being is same to the product the the person's force multiplied through the distance traveled by the wheelbarrow. An alert that once the pressure is exerted ~ above the wheelbarrow, there's a readjust in the motion. Its kinetic energy increases. But where go the wheelbarrow gain its kinetic energy? It come from the human being exerting the force, who offered chemical energy stored in the food lock ate to move the wheelbarrow. In various other words, once the human did work on the wheelbarrow, they moved a certain amount that chemical energy to the wheelbarrow, bring about it to move. Together a result, the person's store of chemical energy decreases and also the wheelbarrow's kinetic energy increases.

### Heat Transfer

Heat is the transport of energy from a warmer object to a cooler object. For example, a lighted complement (higher temperature object) will transfer warmth to a large pan filled through lukewarm water (lower temperature object). Note that the actual amount of thermal power each object has actually doesn't matter, as the pan the lukewarm water might have more thermal energy than the match. What is necessary for warmth transfer come take location is a difference in temperature between 2 objects. Without this difference, no warmth transfer can take place.

Heat have the right to be transferred in 3 ways: by conduction, by convection, and also by radiation.

Conduction is the move of energy from one molecule to one more by direct contact. This deliver occurs as soon as molecules hit versus each other, comparable to a video game of pool where one moving ball strikes another, causing the second to move. Conduction takes location in solids, liquids, and also gases, yet works best in materials that have basic molecules that are located close to every other. Because that example, steel is a far better conductor than lumber or plastic.

Convection is the activity of warmth by a fluid such together water or air. The liquid (liquid or gas) moves from one location to another, transporting heat in addition to it. This activity of a massive of heated water or wait is referred to as a current.

Radiation is the move of heat by electromagnetic waves. When you stand in the sun, you are warmed through the electromagnetic waves, mostly infrared radiation (and to a lesser extent, visible light), that travels indigenous the sunlight to Earth. In enhancement to the sun, irradiate bulbs, irons, and toasters additionally transfer heat via radiation. Note that, unlike conduction or convection, warm transfer through radiation does not need any kind of matter to aid with the transfer.

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