# Physics P1- Energy for the home

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What is heat a measurement of? What is it measure on?
Heat is a measurement of internal energy. It is measure on an absolute scale.
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What is specific heat capacity?
the energy needed to raise the temperature of 1kg by 1oC. Measured in joules per kilogram degrees Celsius (J/kg oC) and differs for different materials.
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What happens when an object is heated and its temperature rises?
Energy is transferred when an object is heated and its temperature rises.
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What is the equation for energy transfer by specific heat capacity?
energy transferred = MASS x SPECIFIC HEAT CAPACITY x TEMPERATURE CHANGE
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Calculate the energy transferred when 30kg of water cools from 25oC to 5oC
2520000J or 2520KJ
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What is specific latent heat?
The energy needed to melt or boil 1kg of the material. Measured in joule per kilogram (J/Kg) and differs for different materials and each of the changes of state.
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What happens when an object is heated and it changes state?
Energy is transferred but the temperature remains constant.
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What is the equation for energy transfer by specific latent heat?
energy transferred = MASS x SPECIFIC LATENT HEAT
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Calculate the energy transferred when 2.5kg of water changes from solid to liquid at 0oC
850000J or 850KJ
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What happens when a substance changes state?
Energy is needed to break the bonds that hold the molecules together. This explains why there is no change in temperature.
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## Other cards in this set

### Card 2

#### Front

What is specific heat capacity?

#### Back

the energy needed to raise the temperature of 1kg by 1oC. Measured in joules per kilogram degrees Celsius (J/kg oC) and differs for different materials.

### Card 3

#### Front

What happens when an object is heated and its temperature rises?

### Card 4

#### Front

What is the equation for energy transfer by specific heat capacity?

### Card 5

#### Front

Calculate the energy transferred when 30kg of water cools from 25oC to 5oC