P1 Flashcards
What is Radiation?
The transfer of heat energy that involves waves so it doesn’t need particles to pass through, so can pass through space
What is convection?
the transfer of heat where the particles heat up and become less dense therefore rise above the denser material. Because they are away from the heat they become more dense and sunk to the bottom. This circle then repeats.
Explain the arrangement of a solid
Packed closely together, in rows
What is conduction?
The transfer of heat by the passing of heat through particles. The heat starts at one end, and as the particles heat up, they start to vibrate. This vibration is passed onto the particles next to them and it gets passed on.
What is specific heat capacity?
Specific heat capacity is the energy required to raise the temperature of 1kg of a material by 1 degree.
How do you find the Specific heat capacity?
SHC= the difference in energy/ the difference in temperature
Explain the arrangement of Liquids
loose, quite close together but randomly laid out.
How do you find the power of an electrical device?
Power= energy transferred/time
How do you find the time? In paying for electricity
Time=Energy transferred/power
How to find the energy transferred, in paying for electricity?
Energy transferred= power x time
What is the energy transferred if the power is 40w and the time 10s?
Energy= power x time Energy= 40w x 10s Energy= 400J
What is the Time is the power is 120W, and the energy 600J?
Time= energy/power Time= 600J/120W Time= 5s
How do you find out the cost for the energy used?
Cost(p)= Energy transferred(kWh) x cost per unit(p/kWh)
How do you find the cost per unit?
Cost per unit(p/Kwh)= cost(p) / energy transferred(kWh)
Name 3 ways to insulate a Building
- Double glazed windows: a vacuum in between the2 panels because a vacuum can only transfer heat energy by radiation.
- Cavity wall insulation: where insulating material is blown into the gap between the brick and the inside wall, which reduces the heat loss by conduction.
- Laying loft insulation: Therefore stops heat loss by conduction.
