P1 Energy Flashcards
(12 cards)
What is energy ( SI unit, definition, symbol)
Energy is the ability to do work
Measured in Joules ( J )
E
What is specific heat capacity
The amount of energy needed to raise the temperature of 1kg of a substance by 1 degrees Celsius
What are the international standard units for specific heat capacity
J/C/Kg
Joules/Degree Celsius/kilogram
What is the definition of power
The rate at which energy is transferred (work is done)
What are the units of power
Watts(W)
What are the 7 energy
- kinetic
- gravitational potential
- chemical
- elastic potential
- thermal
- nuclear
What is the law of the conservation of energy
Energy cannot be created nor destroyed, only transferred from one store to another
What is waste energy
The energy that is not used by the device for its desired purpose
How can efficiency in a system be increased
Reduce waste output (lubrication, thermal insulation)
Recycling waste output
What are the factors that effect the rate of cooling of a building
Wall thickness
Thermal conductivity of the walls
What are 3 ways of reducing heat loss from a building
- double glazing
- insulation
- thicker walls
How can eff
