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1
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Give the Block diagram of the Transmission of Electricity from the power station to the consumer.
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2
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Give the reason for Power Transmission at a very high voltage (132 KV).
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3
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At the Generating Station, why is the electric power generated at 11 KV?
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4
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What is the meaning of "The frequency of alternating current is 50 Hz"?
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5
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What is the meaning of Live, Neutral and Earth wire and use of each wire in the circuit along with their colour coding?
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6
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Draw the diagram of the Ring System of the House Wiring with basic components and give the advantages of the Ring System.
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7
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What are the disadvantages of connecting the appliances in Series and the advantages of connecting them in Parallel?
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8
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What are the uses of Switch, Fuse, MCB, Earthing, 3-pin plug and 3-pin socket?
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9
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Why Fuse and Switch present in Live Wire?
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10
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Draw the diagram of Staircase wiring.
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11
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How Earthing prevents electric shock in the circuit and how it is useless if the Fuse is not present in the Live wire?
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12
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Draw a diagram of 3-pin plugs and a Socket.
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13
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State one circumstance, when one may get an electric shock from an electric gadget and one preventive measure to be provided with the gadget to avoid it.
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14
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Point out main differences between Overloading and Short-Circuiting.
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15
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Name the material which is used as the fuse wire.
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16
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Why is earthing of an electrical appliance necessary?
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17
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State the factors on which the resistance of a wire depends. Also, state how it is affected by the factors stated by you.
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18
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Why should switches always be connected with the live wire?
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19
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Explain the meaning of the statement ‘the power of an appliance is 100W’.
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20
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Define household units of electricity.
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21
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Why is the earth terminal in a plug made (i) thicker (ii) longer as compared to live or neutral terminals.
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22
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Define the materials used for making fuse wire. State two properties of material of fuse wire which make it suitable for use.
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23
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Explain the meaning of the statement ‘current rating of a fuse is 5A’.
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24
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Two fuse wires are rated 5A and 20A. Which of the two is (i) thicker (ii) longer
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25
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Draw the diagram of a dual control switch when the appliance is switched ‘ON’.
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