Energy Flashcards
Specific heat capacity…
the amount of enrrgy needed to raise the temperature of 1kg of a substance by 1 degree
specific heat capacity equation
thermal energy change = mass x specific heat capacity x temp change
Why would you use a bar chart drawn rather than a line graph?
if the data is categoric
The electric kettle shown below is used to boil water.
©leeser87/iStock
(a) After the water has boiled, the temperature of the water decreases by 22 °C.
The mass of water in the kettle is 0.50 kg.
The specific heat capacity of water is 4200 J/kg °C.
Calculate the energy transferred to the surroundings from the water.
46200
Why is the total energy input to the kettle higher than the energy used to heat the water?
Energy is used to heat the kettle.
formula for average pwer output
P= q/ t
The energy transferred from the water in the kettle to the surroundings in 2 hours is
46 200 J.
The mass of water in the kettle is 0.50 kg.
The specific heat capacity of water is 4200 J/kg °C.
The initial temperature of the water is 100 °C.
Calculate the average power output from the water in the kettle to the surroundings in 2 hours.
6.4 w
because p=q( energy transferres to surroundings)/t (time)
power= 46200/ 7200
7200 because 2 hours = 2x 60 x 60
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What insulation foor door
Draught excluder
SAUSAGE DOG
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