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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 377 · 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 lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
  3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
  4. 4.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
  6. 6.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  7. 7.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  8. 8.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
  12. 12.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  15. 15.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  16. 16.🧾 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?
  17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  18. 18.True or false: to use LED lamps wastes electricity. (a) False (b) True
  19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
  20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  22. 22.True or false: to use daylight to read saves electricity. (a) False (b) True
  23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
  24. 24.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
  27. 27.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  28. 28.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
  29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  30. 30.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  31. 31.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) use LED lamps
  35. 35.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
  36. 36.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
  37. 37.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
  39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. an LED lamp
  2. leave the TV on standby
  3. run fans in empty rooms
  4. 6
  5. close the fridge quickly
  6. False
  7. 7.5
  8. True
  9. wastes electricity
  10. False
  11. set the AC to 24 °C
  12. True
  13. wastes electricity
  14. saves electricity
  15. 1 kilowatt-hour (kWh)
  16. 272
  17. saves electricity
  18. False
  19. use old filament bulbs
  20. saves electricity
  21. 238
  22. True
  23. True
  24. True
  25. saves electricity
  26. use LED lamps
  27. True
  28. use old filament bulbs
  29. wastes electricity
  30. 3
  31. True
  32. 80
  33. 420
  34. leave fridge door open
  35. set the AC to 24 °C
  36. use LED lamps
  37. 10
  38. use daylight to read
  39. wastes electricity
  40. 8

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