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Why does not the heating coil produce any visible light? in an electric stove.
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Of the three connecting wires in a household circuit: Which two of the three wires are at the same potential? In which of the three wires should the switch be connected?
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State two advantages of filling an inert gas in an evacuated electric filament lamp.
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A device is used to transform 12 V a.c. to 200 V a.c. What is the name of this device? Name the principle on which it works.
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Which material is the calorimeter commonly made of? Give one reason for using this material.
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Name a metal that is used as an electron emitter. Give one reason for using this metal.
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What is ‘Rating’ of an electric appliance?
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If the rating of an electric bulb is 100W – 230V, Explain its meaning.
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What would happen and why, to an electric bulb when it is connected across a supply of voltage (i) lower (ii) higher than its proper rating?
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An electric bulb is marked 100 W, 230 V. What does this mean?
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Two electric lamps each rating 100 W, 110 V are connected in series to a 220 V power supply and two other electric lamps each of marking 100 W, 220 V are connected in parallel to the same power supply. Will anyone of the two combinations give more light than the other? Give a reason for your answer.
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What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
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What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?
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Give two precautious that you would take while putting off an electric switch.
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What is the function of the split rings in a d.c. motor?
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Why is the electric power from the generating station transmitted at high voltage?
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How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
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How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
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How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
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What do you understand by ‘earthing’? What are the advantages of earthing in a household electric circuit? Explain, how it is done?
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