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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 877 · 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 of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
  2. 2.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  3. 3.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  4. 4.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
  6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  7. 7.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  8. 8.True or false: to leave fridge door open saves electricity. (a) False (b) True
  9. 9.🧾 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?
  10. 10.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
  11. 11.🧾 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?
  12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
  14. 14.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  15. 15.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
  20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
  21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  24. 24.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  25. 25.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  29. 29.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
  31. 31.True or false: to use daylight to read wastes electricity. (a) True (b) False
  32. 32.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  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 10 hours. How many watt-hours (Wh) are saved?
  34. 34.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  35. 35.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
  36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  37. 37.True or false: to use LED lamps saves electricity. (a) True (b) False
  38. 38.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
  39. 39.🔍 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) use old filament bulbs
  40. 40.True or false: to run fans in empty rooms saves electricity. (a) True (b) False

Answer key

  1. run fans in empty rooms
  2. 520
  3. False
  4. 3
  5. leave the TV on standby
  6. saves electricity
  7. 2
  8. False
  9. 126
  10. switch off empty rooms
  11. 34
  12. False
  13. switch off empty rooms
  14. True
  15. False
  16. saves electricity
  17. wastes electricity
  18. True
  19. 1 kilowatt-hour (kWh)
  20. leave fridge door open
  21. False
  22. 51
  23. 1200
  24. False
  25. 20
  26. wastes electricity
  27. saves electricity
  28. 85
  29. 12
  30. use LED lamps
  31. False
  32. 810
  33. 510
  34. True
  35. an LED lamp
  36. True
  37. True
  38. close the fridge quickly
  39. set the AC to 24 °C
  40. False

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