P1 Using energy

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  • Created by: KAustria
  • Created on: 10-06-14 22:01
What are the 8 forms of energy?
1. Light 2. Sound 3. Kinetic 4. Nuclear 5. Electrical 6. Gravitational Potential 7. Elastic 8. Chemical
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That are three forms of stored energy?
1. Gravitational potential energy 2. Elastic potential energy 3. Chemical
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Energy can be ____ form one form to another
transferred
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What type of energy does an object above the ground have?
gravitational potential energy
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What transfer of energy occurs in a falling object?
Gravitational Potential Energy to Kinetic Energy
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Where does chemical energy stored in our muscles come from?
The food you eat
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Can you create or destroy energy?
No it is not possible
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What is the conservation of energy
This states that the total amount of energy is always the same and it applies to all energy transfers.
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What energy transfers take place when you turn on a torch?
Chemical energy to electrical energy to Light energy
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In terms of energy, what happens when you burn a fuel
Chemical energy is transferred to the surroundings as thermal energy
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What type of energy transfer occurs in a pendulum?
A swinging pendulum transfers energy from gravitational potential energy to kinetic energy and back again as it swings.
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What is a machine in terms of energy?
It is something that transfers energy from one place to another or form one form to another.
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What are the two energies we get of a macine?
1. useful energy - The energy transferred to the place we want and in the form we want it 2. Wasted Energy - Energy that is not usefully transferred.
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What happens to the wasted energy from a light bulb?
it is wasted to its surroundings as heat
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What will eventually happen to the useful energy ad wand the wasted energy of a machiine?
It will be transferred to the surroundings and them them warm up
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Why is it diffcult to use energy once it has been transferred to the surroundings?
As it spreads out is becomes more difficult to use for further energy transfers
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Explain how energy is wasted in machines.
Energy is often wasted because of the friction between moving parts of a machine. This energy warms the machine and its surroundings.
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How can friction resulting to energy wastage be useful?
In the brakes of a bicycle or a car. Some of the kinetic energy of the vehicle is transferred to energy heating the brakes in order for it to stop.
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Why should we talk about energy being wasted not being lost?
This is because the conservation of energy states that energy is not created nor destroyed but transferred into different forms
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What is energy measured in?
Joules J
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What is the energy supplied to a machine called?
Input energy
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What is the equation to find out input energy?
Input Energy = Useful Energy + Wasted Energy
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How can you define an 'efficient' machine?
The less energy is wasted, the more efficient the machine is.
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How can you calculate efficiency??
Efficiency = useful energy supplied by the appliance/ total energy supplied to the appliance x 100
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For every 25 houles of energy that are supplied to the bulb, 5 joules are usefully transferred into light energy. What is the efficiency of the bulb?
5/ 25 = 0.2
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What appliance can be 100% efficient?
An electric heater which usefully transfers all of the electrical energy supplied to it by heating its surroundings.
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What can be used to display the energy transfer in an appliance?
A Sankey diagram
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What measures can be used to make machines more efficient by reducing?
1. Friction 2. air resistance 3. electrical resistance 4. noise due to vibrations
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Other cards in this set

Card 2

Front

That are three forms of stored energy?

Back

1. Gravitational potential energy 2. Elastic potential energy 3. Chemical

Card 3

Front

Energy can be ____ form one form to another

Back

Preview of the front of card 3

Card 4

Front

What type of energy does an object above the ground have?

Back

Preview of the front of card 4

Card 5

Front

What transfer of energy occurs in a falling object?

Back

Preview of the front of card 5
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