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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 858 · 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.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  2. 2.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  5. 5.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
  6. 6.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  8. 8.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
  10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
  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 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?
  14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  16. 16.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  19. 19.🧾 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?
  20. 20.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
  21. 21.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
  23. 23.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  25. 25.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
  26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
  30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
  31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  34. 34.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to leave fridge door open saves electricity. (a) True (b) False
  36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  39. 39.True or false: to use daylight to read saves electricity. (a) False (b) True
  40. 40.True or false: to use old filament bulbs saves electricity. (a) True (b) False

Answer key

  1. wastes electricity
  2. 2
  3. saves electricity
  4. saves electricity
  5. switch off empty rooms
  6. True
  7. 240
  8. 440
  9. 1 kilowatt-hour (kWh)
  10. 567
  11. iron one shirt at a time
  12. 441
  13. 126
  14. False
  15. saves electricity
  16. 8
  17. saves electricity
  18. 600
  19. 153
  20. unplug idle chargers
  21. close the fridge quickly
  22. use LED lamps
  23. 1.5
  24. wastes electricity
  25. an LED lamp
  26. 595
  27. wastes electricity
  28. 102
  29. False
  30. leave the TV on standby
  31. 102
  32. 180
  33. saves electricity
  34. 0.4
  35. False
  36. set the AC to 24 °C
  37. 120
  38. 34
  39. True
  40. False

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