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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 917 · 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.True or false: to use daylight to read wastes electricity. (a) False (b) True
  2. 2.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
  6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  7. 7.🧾 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?
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  9. 9.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
  10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
  11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) set the AC to 24 °C
  13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
  14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
  16. 16.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  17. 17.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  18. 18.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
  21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
  24. 24.🧾 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?
  25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
  26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  27. 27.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) close the fridge quickly
  28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  29. 29.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  30. 30.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
  31. 31.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  33. 33.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
  36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  38. 38.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  39. 39.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True

Answer key

  1. False
  2. 8
  3. 520
  4. wastes electricity
  5. use old filament bulbs
  6. saves electricity
  7. 272
  8. 1 kilowatt-hour (kWh)
  9. use LED lamps
  10. set the AC to 24 °C
  11. False
  12. iron one shirt at a time
  13. switch off empty rooms
  14. 850
  15. use daylight to read
  16. True
  17. 1.5
  18. True
  19. 255
  20. close the fridge quickly
  21. saves electricity
  22. wastes electricity
  23. True
  24. 441
  25. leave fridge door open
  26. saves electricity
  27. run fans in empty rooms
  28. wastes electricity
  29. False
  30. use old filament bulbs
  31. 4
  32. True
  33. 5
  34. 450
  35. leave fridge door open
  36. 408
  37. saves electricity
  38. True
  39. 0.2
  40. False

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