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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 211 · 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 set the AC to 24 °C wastes electricity. (a) False (b) True
  2. 2.True or false: to use daylight to read wastes electricity. (a) True (b) False
  3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  4. 4.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
  7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  8. 8.True or false: to use daylight to read saves electricity. (a) True (b) False
  9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
  11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  13. 13.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  15. 15.🧾 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?
  16. 16.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  18. 18.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  20. 20.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  21. 21.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  22. 22.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
  23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
  24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  26. 26.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
  27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
  30. 30.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  32. 32.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
  34. 34.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 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?
  37. 37.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  40. 40.True or false: to close the fridge quickly saves electricity. (a) False (b) True

Answer key

  1. False
  2. False
  3. True
  4. 200
  5. 1 kilowatt-hour (kWh)
  6. use LED lamps
  7. saves electricity
  8. True
  9. True
  10. an LED lamp
  11. wastes electricity
  12. set the AC to 24 °C
  13. False
  14. wastes electricity
  15. 126
  16. 1.25
  17. wastes electricity
  18. False
  19. saves electricity
  20. 1.2
  21. use daylight to read
  22. run fans in empty rooms
  23. run fans in empty rooms
  24. False
  25. 0.2
  26. use old filament bulbs
  27. 255
  28. wastes electricity
  29. leave fridge door open
  30. False
  31. 510
  32. 1.5
  33. switch off empty rooms
  34. 6
  35. 1.6
  36. 238
  37. 2
  38. saves electricity
  39. 1260
  40. True

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