P1.2 Energy and Efficiency Flashcards
What does dissipated mean?
spread out and lost
What happens when energy is transferred?
only part of it may be usefully transferred, the rest is ‘wasted’
What happens to wasted energy?
It dissipates into the surroundings
causes surroundings to become warmer.
Describe the energy transfers that take pace in a television
electrical energy- light, sound and heat energy
What are some positives and negatives of LED bulbs?
efficient, low-energy, last longer
more expensive, don’t give out as much light as over bulbs
How are heat exchangers useful and what do they do?
reduce the amount of energy that is lost by pumping cool fluid through escaping heat. Temperature of this fluid rises as it gains heat energy. Heat energy in fluid can be converted into a form of energy that’s useful again.
Describe the energy transfer that occurs in a wind turbine
kinetic—- electrical and heat
What is the conservation of energy principle?
Energy can be transferred usefully, stored or dissipated, but can not be created or destroyed.
What is meant by a device being efficient?
A small proportion of energy is wasted
Why does a heat exchanger cost money to run?
electrical energy is needed to run the pump is a heat exchanger which costs money
Batteries store ………… energy
chemical
an electric motor transfers electrical energy usefully into………… energy
kinetic
Batteries store ………… energy
chemical
an electric motor transfers electrical energy usefully into………… energy
kinetic
