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Electric Power and Household Electricity (Solved) Question .1. What do you understand by 1 kilowatt hour? Question .2. An electric bulb has a filament and gases filled at low pressure. (i) What is the material commonly used for the filament? (ii) Name the gases used for filling the bulb. Question .3. Name the colour of the three core cable along with their corresponding electrical connections to a socket Question .4. Which part of an electric appliance is earthed? Question .5. Define 1 watt and 1 kilowat Question .6. There are three pins in an electric plug top. Answer the following : (i) How would you identify the earth pin? (ii) In which of the three connecting wires should the electric switch be connected? (iii) Explain why a switch should not be touched with wet hands. Question .7. Give one example each of material suitable for making (i) fuse wire and (ii) heater elemen Question .8. Score off the incorrect and write correctly the following : In wiring a three pin plug, the brown sleeved wire is connected to the material/live pin and the green/ blue sleeved wire is connected to the metal body of the appliance. Question .9. You have just paid the electricity bill for your house (i) what was it that your family consumed, for which you had to pay? (ii) In what unit was it measured? Question .10. What are high tension wires? Give two characteristics of these wires. Question .11. Why is the filament of an electric iron or kettle put between mica sheets? Question .12. Explain briefly how a fuse protects an electric circuit? Question .13. What is earthing? What is its use? Or What is meant by earthing of an electrical appliance? Why is it essential? Question .14. What is meant by earthing of an electrical appliance? How does earthing offer protection? Question .15. Name the material used for making fuse wire. State two properties of the material of fuse wire which make it suitable for use. Question .16. Under what circumstances does one get an electric shock from an electric appliance? Question .17. How does the power rating of a device help us to decide about the type of leads (connecting wires) to be used for that? Question .18. Explain briefly the function of the following in the household wiring (i) a three pin plug and (ii) main switch. Question . 19. Make a table with names of 3 electrical appliances used in your home in one column, their power, voltage rating and approximate time for which each is used in one day in the other column. Question .20. Which of the two wires of similar dimension, copper or nichrome, would you use for the electric heater. Give reasons to justify your answer. Question .21. Two fuse wires of the same length are rated 5 A and 20 A. Which of the two fuse wires is thicker and why? Question .22. Electric power P is given by the expression P = (Q V) (i) What do the symbol Q and V represent? (ii) Express power in terms of current and resistance explaining the symbols used their in. Question .23. State the purpose of a fuse in an electric circuit. Name the material used for making a fuse wire. Question .24. In a three-pin plug, why is the earth pin made longer and thicker than the other two pins? Question .25. Draw a labelled diagram of a three-pin socket. Answer : Click Here Question .26. Of the three connecting wires in a household circuit : (i) Which two of the three wires are at the same potential? (ii) In which of the three wires should the switch be connected? Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289] Electric Power and Household Electricity [Numericals] (Solved) Numerical 1. An electric heater is rated 500 kVA, 220 V. If the heater is operated for 1 hour, calculate the energy consumed (i) in kWh and (ii) in joule. Solution : Click Here Numerical 2. Convert 1 kWh into joule. Solution : Click Here Numerical 3. An electric bulb is marked 220V 100 W. The bulb is connected to a 220 V supply. (i) Calculate (a) the resistance of the filament. (b) Current flowing through the filament. (ii) is the filament resistance of the glowing bulb greater, smaller or same as compared to its resistance when it is not glowing? Solution : Click Here Numerical 4. A refrigerator is marked 80 W, 220 V. (i) How much energy does it consume in one day if on an average it is used for 20 hours a day? (ii) What is likely to happen if the voltage drops to 50 V. Solution : Click Here Numerical 5. What quantity of heat will be produced in a coil of resistance 80 ohm if current of 3 A is passed through it for 4 second. Solution : Click Here Numerical 6. Calculate the electrical energy in SI units consumed by a 100 W bulb and a 60 W fan connected in parallel in 5 minutes. Solution : Click Here Numerical 7. A family uses a light bulb of 100 W, a fan of 100 W and an electric heater of 1000 W each for 8 hours daily. If the cost of electricity is Rs2.00 per unit, what is the expenditure for the family per day on electricity? Solution : Click Here Numerical 8. A bulb is marked 100 W, 220 V and an electric heater is marked 2000 W, 220 V (i) What is the ratio of their resistances? (ii) In which of the above a thicker connecting wire or lead is required? Solution : Click Here Numerical 9. A geyser has a label 2 kW, 240 V. What is the cost of running it for 30 minute, if the cost of electricity is Rs3.00 per unit? Solution : Click Here Numerical 10. An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at 60 paisa per unit. Solution : Click Here Paper By Mr. M. P. 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