P1 - Specific Heat Capacity Flashcards
What is the formula for specific heat capacity?
E = mc(theta)
Energy transferred = mass * specific heat capacity * temperature change
What is the specific heat capacity of water?
4200 Joules per kg per degrees C
How much energy is needed to heat 2kg of water from 10 degrees to 100 degrees C?
100 - 10 = 90
Energy = 2 * 4200 * 90
Energy = 756000J
What appliance needs a high specific heat capacity and why?
Materials used in heaters need a high specific heat capacity so that they can store large amounts of heat energy
Why is water used for central heating systems?
High specific heat capacity to store heat
Liquid that can be pumped around a house easily
What are electric storage heaters?
Heaters that store heat energy at night (electricity cheaper) and release it during the day
How do electric storage heaters work?
They store the heat in concrete or bricks because they have a high specific heat capacity
What other liquid can be used in heaters and why is it used?
Oil because it has a high boiling point so you don’t have to worry about it evaporating at higher temperatures
Why is water preferable to oil in heaters?
Water has a much higher specific heat capacity
What is specific heat capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1 degrees C
