Energy Flashcards
When something falls……
Energy is transferred from its gravitational potential energy store to its kinetic energy store.
What does stretching transfer energy to?
The elastic potential energy store.
What is specific heat capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree celsius.
Why would you wrap a metal block in insulating layers?
To reduce energy transferred to surroundings.
Energy is never ……..
Created or destroyed can only be transferred or dissipated or stored.
Dissipated energy is sometimes called…….because…
Wasted energy because the energy is being stored in away that is not useful.
Power is the ……………………….. …………………………….
Rate of doing work.
What is power measured in?
Watts
One watt=
one joule of energy transferred per second.
Give two examples of non-renewable energy resources??
Fossil fuels and nuclear fuel.
Name the three main fossil fuels??
- Coal
- Oil
- Gas
Give some examples of renewable energy resources?
- The sun
- Wind
- Water waves
- Hydro- electricity
What is the problem with renewable energy resources?
They don’t provide much energy and some are unreliable.
What is conduction?
The process where vibrating particles transfer energy to neigbouring particles.
High thermal conductivity=
Transfer energy between particles quicky.
Name two ways to stop energy travelling to completely useless stores?
- Lubrication
- Thermal insulation
What does lubrication do?
Reduces frictional forces
What does insulation do?
Reduces the rate of energy transfers by heating.
The less energy that is wasted=
The more efficient a device is.
What are bio-fuels made from?
Plants and waste.
