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P1 Physics > Heating homes > Flashcards

Heating homes Flashcards

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1
Q

what is a thermogram?

A

a picture that uses colour to indicate the hottest and coldest parts

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2
Q

what is temperature a measure of? and on what scale?

A

it is a measure of hotness on an arbitrary scale

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3
Q

what happens to the particles when the temperature of the body increases?

A

the average kinetic energy of the particles increase

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4
Q

what is heat a measure of? and what scale is it measured on?

A

heat is a measurement of internal energy. It is measured on an absolute scale

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5
Q

what is SHC?

A

The energy needed to raise the temperature of 1kg by 1 degree

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6
Q

what is SHC measured in?

A

joules per kilogram degree celsius (J/Kg degree celsius)

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7
Q

what is SLH?

A

the energy needed to melt or boil 1kg of the material

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8
Q

what is SLH measured in?

A

joule per kilogram

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9
Q

Explain why their is no change in temperature when a substance is heated?

A

because energy is needed to break the bonds that hold the molecules together

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10
Q

what is heat measured in?

A

amount of energy

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11
Q

what Is the unit of energy?

A

joule

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12
Q

what is temperature a measure of?

A

the average kinetic energy of the particles

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13
Q

what if heat a measure of?

A

the total internal energy of an object

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14
Q

what can the energy needed to change the temperature of a liquid be measured by?

A

using an electrical immersion heater connected to a joulemeter

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15
Q

what is latent heat?

A

the heat needed to change a state without a change in temperature

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16
Q

which is better a low U value or a higher U value and why?

A

lower because less heat is transferred

17
Q

what it temperature a measure of?

A

how hot something is

18
Q

what would cool down faster:
a room at 50 degrees above room temp
or a room at 5 degrees above room temp

A

a room at 3 degrees

19
Q

what might cold solid objects do?

A

melt

20
Q

what graph would be best to present how a temperature cools down to room temp?

A

curved from top right to bottom right

21
Q

what would happen if you put an ice cube on your hand?

A

your hand would get colder because energy flows from a warmer to a colder body

22
Q

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

A

energy is transferred

23
Q

why is there no change in temperature when a substance changes state?

A

because energy is needed to break the bonds that hold the molecules together

P1 Physics (8 decks)

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