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

### Energy Transfer

The two ways that energy can be transferred space by law work and by heat transfer.

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### Doing Work

Energy have the right to be transferred from one thing to another by act work. To do occupational requires that an agent exert a force on an object over a distance. When work-related is done, energy is moved from the certified dealer to the object, which outcomes in a change in the object's movement (more special, a readjust in the object's kinetic energy).

### An example of how Doing occupational Transfers energy from One thing to Another

Suppose the a human being (the agent) exerts a force on a wheelbarrow (the object) that is at first at rest, leading to it to relocate over a certain distance. Recall that the job-related done on the wheelbarrow through the human being is same to the product of the person's force multiplied by the street traveled by the wheelbarrow. Notification that once the force is exerted on the wheelbarrow, there's a adjust in that motion. That kinetic energy increases. But where go the wheelbarrow gain its kinetic energy? It come from the human exerting the force, who provided chemical power stored in the food they ate to relocate the wheelbarrow. In various other words, when the person did job-related on the wheelbarrow, they moved a specific amount of chemical power to the wheelbarrow, resulting in it to move. As a result, the person's store of chemical power decreases and the wheelbarrow's kinetic power increases.

### Heat Transfer

Heat is the deliver of power from a warmer thing to a cooler object. For example, a lighted match (higher temperature object) will transfer heat to a big pan filled through lukewarm water (lower temperature object). Keep in mind that the actual amount of thermal energy each object has doesn't matter, as the pan the lukewarm water can have an ext thermal power than the match. What is essential for heat transfer to take place is a difference in temperature between 2 objects. There is no this difference, no warm transfer have the right to take place.

Heat can be moved in three ways: by conduction, by convection, and also by radiation.

Conduction is the transfer of power from one molecule to an additional by straight contact. This carry occurs once molecules hit versus each other, similar to a video game of pool where one moving ball strikes another, resulting in the second to move. Conduction takes place in solids, liquids, and gases, yet works best in products that have simple molecules that are located close to each other. For example, steel is a far better conductor than timber or plastic.

Convection is the movement of heat by a fluid such together water or air. The fluid (liquid or gas) moves from one place to another, carrying heat along with it. This movement of a mass of boil water or air is dubbed a current.

Radiation is the deliver of warmth by electromagnetic waves. When you stand in the sun, you space warmed by the electromagnetic waves, greatly infrared radiation (and to a lesser extent, clearly shows light), that travels from the sunlight to Earth. In enhancement to the sun, irradiate bulbs, irons, and toasters likewise transfer heat via radiation. Keep in mind that, uneven conduction or convection, warmth transfer by radiation does not need any type of matter to aid with the transfer.

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