1796042
Frage 1
Frage
Which of these are forms of energy waiting to be turned into one of the other forms? (Tick all that apply)
Antworten
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Thermal
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Chemical potential
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Gravitational potential
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Kinetic
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Electrical
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Light
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Elastic potential
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Nuclear
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Sound
Frage 2
Frage
What is the principle of the conservation of energy?
Antworten
-
Energy can never be created or destroyed; it can only be converted from one form to another.
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Energy can be created or destroyed; it can also be converted from one form to another.
Frage 3
Frage
A light bulb has a total energy input of 200J. 190J of this is wasted energy. Work out the energy efficiency.
Antworten
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10%
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5%
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90%
Frage 4
Frage
Draw a Sankey diagram for a candle which wastes most of its energy as heat.
Antworten
-
Image:physics_1 (image/png)
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Image:physics_2 (image/png)
Frage 5
Antworten
-
kinetic ---> electrical
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electrical ---> sound ---> light
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gravitational potential ---> kinetic ---> electrical
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gravitational potential ---> electrical ---> sound
Frage 6
Frage
Tick all of the true statements.
Antworten
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A device which transfers one form of energy into another is called a transducer.
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Energy is normally wasted as heat and sound.
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Wasted energy dissipates into the surroundings.
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Dissipated energy cannot be re-used.
Frage 7
Frage
Which type of heat energy transfer only takes place in fluids and involves warmer, less dense regions of fluid moving upwards and being replaced by colder, sinking fluids?
Antworten
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Conduction
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Convection
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Radiation
Frage 8
Frage
All types of energy require particles to be transferred.
Antworten
- True
- False
Frage 9
Frage
Which of these loses energy more quickly?
Antworten
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A bright, shiny surface
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A dull, black surface
Frage 10
Frage
Which features of a vacuum flask prevent heat loss by conduction?
Antworten
-
A thin vacuum between the walls
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Silvered walls
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Cork or plastic stopper
Frage 11
Frage
Find the work done by a car driving at a force of 500N 200m down a road.
Antworten
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1000J
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5000J
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700J
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300J
Frage 12
Frage
What is power?
Antworten
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Power is the rate of doing work.
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Power = work done x time taken
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Power = work done/time taken
Frage 13
Frage
How fast does a stone weighing 4kg fall from a height of 200m?
Antworten
-
28 m/s
-
800 m/s
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63 m/s
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