Difference between revisions of "Energy Transfer"
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*[[Radiation|By radiation]] - By [[Light]] [[wave]]s or [[Sound]] [[wave]]s. | *[[Radiation|By radiation]] - By [[Light]] [[wave]]s or [[Sound]] [[wave]]s. | ||
*[[Heating|By heating]] - By [[Thermal Conduction|conduction]], [[convection]] or [[Thermal Radiation|radiation]]. | *[[Heating|By heating]] - By [[Thermal Conduction|conduction]], [[convection]] or [[Thermal Radiation|radiation]]. | ||
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| + | ===Real World Energy Transfers=== | ||
| + | When describing the '''energy transfers''' in a [[system]] the initial [[Energy Store|energy store]] and final [[Energy Store|energy store]] are stated. | ||
| + | ''NB: It is important to note which [[object]] has the [[Energy Store|energy store]]. It is not enough to say a "[[Thermal Energy Store]]", it must be a "[[Thermal Energy Store]] of the [[object]]".'' | ||
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| + | ====Going Up==== | ||
| + | : When an [[object]] travels upwards the [[Gravitational Potential Energy Store|gravitational potential energy store]] increases. | ||
| + | The following are examples of '''energy transfers''' into the [[Gravitational Potential Energy Store|gravitational potential energy store]]: | ||
| + | *A ball starts in motion but comes to rest at its maximum height. | ||
| + | ''[[Kinetic Energy Store]] of the ball → [[Gravitational Potential Energy Store]] of the ball.'' | ||
| + | *A bullet is fired upwards and comes to rest at its maximum height. | ||
| + | ''[[Chemical Potential Energy Store]] of the gunpowder → [[Gravitational Potential Store]] of the bullet.'' | ||
| + | *An [[arrow]] is fired upwards and comes to rest at its maximum height. | ||
| + | ''[[Elastic Potential Energy Store]] of the bow → [[Gravitational Potential Energy Store]] of the arrow.'' | ||
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===Examples=== | ===Examples=== | ||
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The high [[temperature]] causes the [[Electrical Bulb|bulb]] to glow, [[emit]]ting [[Visible Light]]. This [[Visible Light]] '''transfers energy by radiation''' to the surroundings. | The high [[temperature]] causes the [[Electrical Bulb|bulb]] to glow, [[emit]]ting [[Visible Light]]. This [[Visible Light]] '''transfers energy by radiation''' to the surroundings. | ||
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Revision as of 13:45, 2 February 2019
Contents
Key Stage 3
Meaning
An Energy Transfer is when energy moves from one energy store to another energy store.
About Energy Transfers
- Energy can be transferred from one object to another or between energy stores within the same object. For example on a pool table when white ball hits another ball energy is transferred from the kinetic store of the white ball to the kinetic store of the other ball.
There are 4 ways energy can be transferred;
- Mechanically - By the action of a force.
- Electrically - By an electrical current.
- By radiation - By Light waves or Sound waves.
- By heating - By conduction, convection or radiation.
Key Stage 4
Meaning
An Energy Transfer is when energy moves from one energy store to another energy store.
About Energy Transfers
- Energy and be transferred between stores in a system. This may be between the different energy stores of a single object or between the energy stores of different objects within that system.
- When there is an energy transfer energy is neither created, nor destroyed. This means when that when one energy store decreases, one or more others must increase.
- Humans use energy transfers for a number of reasons but they usually result in some energy being transferred to an unwanted store. This is known as Wasted Energy.
There are 4 ways energy can be transferred;
- Mechanically - By the action of a force.
- Electrically - By an electrical current.
- By radiation - By Light waves or Sound waves.
- By heating - By conduction, convection or radiation.
Real World Energy Transfers
When describing the energy transfers in a system the initial energy store and final energy store are stated. NB: It is important to note which object has the energy store. It is not enough to say a "Thermal Energy Store", it must be a "Thermal Energy Store of the object".
Going Up
- When an object travels upwards the gravitational potential energy store increases.
The following are examples of energy transfers into the gravitational potential energy store:
- A ball starts in motion but comes to rest at its maximum height.
Kinetic Energy Store of the ball → Gravitational Potential Energy Store of the ball.
- A bullet is fired upwards and comes to rest at its maximum height.
Chemical Potential Energy Store of the gunpowder → Gravitational Potential Store of the bullet.
- An arrow is fired upwards and comes to rest at its maximum height.
Elastic Potential Energy Store of the bow → Gravitational Potential Energy Store of the arrow.
Examples
 |
 |
| The front brakes of this car are glowing from the high temperature. Energy has been transferred by friction from the Kinetic Energy Store of the car to the Thermal Energy Store of the brakes.
The high temperature of the brakes causes them to heat the air around them. Energy is being tansferred by heating from the Thermal Energy Store of the brakes to the Thermal Energy Store of the air around them. |
Electricity transfers energy into the Thermal Energy Store of the filament inside the bulb.
The high temperature causes the bulb to glow, emitting Visible Light. This Visible Light transfers energy by radiation to the surroundings. |