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Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
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Name the device or machine which convert :
Chemical energy into heat energy.
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Name the device or machine which convert :
light energy into heat energy.
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Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
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When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
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The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
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What kind of energy transformation take place at a hydroelectric power station?
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What kind of energy transformations take place at a coal-based thermal power station?
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How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
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How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
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Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
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Describe the energy changes which take place in a radio.
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Write the energy transformations which take place in an electric bulb (or electric lamp).
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A bulb lights up when connected to a battery. State the energy change which takes place :
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The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
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What do you understand by the term 'transformation of energy"? Explain with an example.
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Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
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What is the meaning of the symbol kWh? What quantity does it represent?
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How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
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Name the energy transfers which occur when an electric ball rings.
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