19 solutions available
Question 1Explain with the aid of a simple diagram, the transmission of electric power from the generating station to your house.
Question 4Figure below shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:(a) How is the...
Question 2In the transmission of power the voltage of power generated at the generating station is stepped up from 11 kV to 132 kV before it is...
Question 7Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also...
Question 5What purpose is served by the terminals of a three way pin plug? Draw a diagram and name the pins.
Question 6Draw a labelled diagram of a three pin socket.
Question 12Figure below shows two bulbs with switches and fuse connected to the mains through a three pin socket by means of a three wires cable.(a)...
Question 9Assertion (A): A fuse wire must have a high resistance and low melting point.Reason (R): A fuse is only used for a small current flow.Both...
Question 10Assertion (A): Same current flows through the live wires and the filament of a bulb, but the heat produced in the filament is much...
Question 3How is a fuse put in an electric circuit? State the purpose of using a fuse in a circuit.
Question 8An electrical kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating...
Question 11The diagram in figure shows a three pin plug. Label the three pins.(a) Why is top pin thicker and longer than the other two?(b) Why are...
Question 13(a) The earthing of an electric appliance is useful only if the fuse is in the live wire. Given the reason.(b) Name the part of the...
Question 14For earthing an electrical appliance, one has to remove the paint from the metallic body of the appliance where the electrical contact is...
Question 15How does the colour code of wires in a cable help in house wiring?
Question 16Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?
Question 17Give two characteristics of a high tension wire.
Question 18Which of the cables, one rated 5 A and the other rated 15 A will be of thicker wire? Give a reason for your answer.[Hint :To carry heavy...
Question 19The diagram in figure shows three lamps and three switches 1, 2 and 3 connected with two cells.(a) Name the switch/switches to be closed...