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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 606 · 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 old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
  2. 2.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
  4. 4.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) close the fridge quickly
  6. 6.True or false: to use daylight to read saves electricity. (a) False (b) True
  7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  8. 8.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  10. 10.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  11. 11.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
  13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  15. 15.🧾 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?
  16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  17. 17.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
  18. 18.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
  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 1 hour. How many watt-hours (Wh) are saved?
  20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
  23. 23.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
  26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  27. 27.True or false: to leave fridge door open saves electricity. (a) False (b) True
  28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
  29. 29.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
  31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  34. 34.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  35. 35.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  37. 37.True or false: to use LED lamps saves electricity. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
  39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  40. 40.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. set the AC to 24 °C
  2. 1190
  3. close the fridge quickly
  4. True
  5. iron one shirt at a time
  6. True
  7. wastes electricity
  8. use LED lamps
  9. 1 kilowatt-hour (kWh)
  10. False
  11. 0.4
  12. use daylight to read
  13. False
  14. wastes electricity
  15. 306
  16. 320
  17. iron one shirt at a time
  18. run fans in empty rooms
  19. 34
  20. saves electricity
  21. 3
  22. leave the TV on standby
  23. 0.2
  24. 306
  25. use daylight to read
  26. saves electricity
  27. False
  28. leave fridge door open
  29. 3
  30. set the AC to 24 °C
  31. 400
  32. saves electricity
  33. 136
  34. True
  35. 1.6
  36. 7.5
  37. True
  38. run fans in empty rooms
  39. 560
  40. 1.5

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