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How many kWh is one unit?

Important Questions on Work, Energy and Power

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Science>Physics>Work, Energy and Power>Types of Energy
MeV c-2 is a unit of
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What is the use of watt-hour meter in a household circuit?
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The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire? 

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What is the meaning of the symbol kWh? What quantity does it represent?
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If an electric bulb of 100 W is lighted for 20 hours, how much electrical energy will be consumed? Also find the cost, if 1 unit costs ₹4.
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Define one kilowatt-hour.
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(a) Draw a schematic diagram of common domestic circuit.

(b) State the function of fuse and earth wire.

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A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
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In a domestic circuit mention the potential difference between the live wire and neutral wire and frequency of A.C.
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How is electricity bill calculated?
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Give the difference between kWh and kW.
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If an electric bulb of 60 W is lighted for 10 hours, how much is the electrical energy consumed in joules.
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Air conditioners and water heaters are connected to the power sockets at home. What happens if they are mistakenly plugged into normal sockets?
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In a house 3 bulbs of 25 W each are used for 5 hours a day. Calculate the units of electricity consumed in a month of 31 days. Also, find the total expenditure if one unit of electricity costs Rs. 2.50.
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Mention the colour convention of live, neutral and earth wire.
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Science>Physics>Work, Energy and Power>Types of Energy
Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?
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Derive the relationship between the SI unit of electrical energy and commercial unit of energy.
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The commercial unit of energy is
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In spite of the SI unit of electrical energy, there is a need for the commercial unit of energy. Give reasons.
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Cotyledons are also called-