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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 130 · 40 questions
TalentJR

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

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  1. 1.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
  3. 3.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  4. 4.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
  5. 5.True or false: to use LED lamps saves electricity. (a) True (b) False
  6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  9. 9.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
  11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
  12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
  16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
  18. 18.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  21. 21.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  22. 22.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  26. 26.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  27. 27.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
  30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) run fans in empty rooms
  31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  34. 34.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  35. 35.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
  36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

Answer key

  1. 0.2
  2. iron one shirt at a time
  3. 1440
  4. iron one shirt at a time
  5. True
  6. saves electricity
  7. 1 kilowatt-hour (kWh)
  8. 560
  9. True
  10. close the fridge quickly
  11. an LED lamp
  12. 441
  13. 490
  14. 153
  15. use old filament bulbs
  16. wastes electricity
  17. use LED lamps
  18. False
  19. 272
  20. 504
  21. True
  22. False
  23. 68
  24. saves electricity
  25. 126
  26. 1170
  27. True
  28. saves electricity
  29. use daylight to read
  30. run fans in empty rooms
  31. 850
  32. 1260
  33. wastes electricity
  34. 0.2
  35. use LED lamps
  36. 650
  37. True
  38. wastes electricity
  39. 306
  40. saves electricity

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