Physics Heat + Heat Transfer

Question 0

Specific heat capacity

Answer 0

Heat Energy needed to change the temperature of 1 Kg of a object by 1*C/ 1K
Symbol -c
Formulae - mass(c)change in temprature

Question 1

Heat capacity

Answer 1

Heat capacity of an object is the amount of heat energy needed to change it’s temprature by 1K /1*C
Symbol - C
Formulae - change in temprature(C)

Question 2

Specific Latent heat

Answer 2

Heat energy needed to change objects state without any change in temperature
Symbol- l
Formulae - mass(l)

Question 3

Specific latent heat -of fusion

-of vaporisation

Answer 3

Heat energy needed to change the state of 1 Kg of a body without any change in temperature
Fusion- solid to liquid & reverse
Vaporisation- liquid to gas & revers 
Symbol- L 
                    Formulae- mass(L)

Question 4

Conduction

Answer 4

Method of heat transfer
Heat passes through a substance by passing on of molecular vibrations from molecule to molecule in the substance, no overall movement of substance

Question 5

U - value

Answer 5

It is amount of heat energy conducted per second by 1m(2) of a structure when temperature difference of 1K / 1*C is maintained between it’s end
Used to measure how well a structure eg roof conducts heat

Question 6

Radiation

Answer 6

Transfer of heat from one place to another in the firm of electromagnetic waves

Question 7

Convection

Answer 7

Movement of heat through a substance by means of circulating currents in the fluid caused by heat

Question 8

Pump

Answer 8

Transfer heat cold—> warm
Eg REFRIGERATORS
Volatile liquid pumped around closed circuit
EXPANSION VALVE, pressure DECREASE , VAPORISES takes in latent heat (cooling fridge)
COMPRESSOR, pressure INCREASES turns back to liquid gives OUT
LATENT heat to surroundings from black pipes & cooling fins

Question 9

Heat

Answer 9

Energy (J) moves from warmer bodies to colder ones until both are the same temprature

Question 10

Expts

Answer 10

-