# Energy Transfer

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• Created by: Mit desai
• Created on: 10-05-16 09:41
Transfer of thermal energy by electromagnetic waves
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Conduction
The transfer of heat energy without the substance itself moving
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Convection
The transfer of heat energy through movement. This occurs in liquids and gases and creates a convection current
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Condensation
When a warm gas comes in contact with a cold surface which forms a liquid, energy is released and can make the temperature increase
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Evaporation
A liquid evaporates when its particles have gained enough energy to escape the surface of the liquid and become a gas
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U-Value
U-Value of a material indicates how effective a material is as an insulator because it shows how quickly heat energy can pass through. A low U-Value means that heat flows slowly
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Specific heat capacity
The specific heat capacity of a substance is the amount of energy needed to change the temperature of one kilogram of it by one degree Celsius. Eg. Energy transferred(J)=Mass(kg)* Specific heat capacity (J/kg°C)* Temperature change (°C)
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Payback Time
Payback Time(Years)= Total cost of improvement/savings per year
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## Other cards in this set

### Card 2

#### Front

The transfer of heat energy without the substance itself moving

Conduction

### Card 3

#### Front

The transfer of heat energy through movement. This occurs in liquids and gases and creates a convection current

### Card 4

#### Front

When a warm gas comes in contact with a cold surface which forms a liquid, energy is released and can make the temperature increase

### Card 5

#### Front

A liquid evaporates when its particles have gained enough energy to escape the surface of the liquid and become a gas