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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 343 · 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.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
  2. 2.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  5. 5.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
  8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
  9. 9.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
  10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  11. 11.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  12. 12.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  13. 13.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
  15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
  16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
  17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  19. 19.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  21. 21.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
  22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  23. 23.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  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 10 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  28. 28.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  30. 30.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
  31. 31.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  32. 32.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  33. 33.🧾 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?
  34. 34.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
  36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  38. 38.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
  39. 39.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

Answer key

  1. use daylight to read
  2. use daylight to read
  3. 1 kilowatt-hour (kWh)
  4. wastes electricity
  5. 8
  6. 252
  7. set the AC to 24 °C
  8. run fans in empty rooms
  9. leave the TV on standby
  10. saves electricity
  11. 8
  12. True
  13. False
  14. unplug idle chargers
  15. an LED lamp
  16. set the AC to 24 °C
  17. wastes electricity
  18. False
  19. True
  20. 240
  21. use old filament bulbs
  22. 1080
  23. False
  24. 630
  25. 340
  26. 240
  27. False
  28. 4
  29. 170
  30. unplug idle chargers
  31. True
  32. False
  33. 153
  34. 0.3
  35. leave fridge door open
  36. 1
  37. saves electricity
  38. switch off empty rooms
  39. False
  40. 1530

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