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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 469 · 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.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  2. 2.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  6. 6.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
  8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
  9. 9.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  12. 12.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  14. 14.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  16. 16.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  17. 17.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.True or false: to use LED lamps saves electricity. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
  21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  22. 22.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
  24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
  26. 26.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  27. 27.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  29. 29.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
  33. 33.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  35. 35.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  38. 38.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  39. 39.True or false: to leave fridge door open saves electricity. (a) False (b) True
  40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby

Answer key

  1. 6
  2. 700
  3. 300
  4. False
  5. wastes electricity
  6. 0.1
  7. an LED lamp
  8. use old filament bulbs
  9. 490
  10. 1 kilowatt-hour (kWh)
  11. wastes electricity
  12. True
  13. False
  14. True
  15. saves electricity
  16. True
  17. 15
  18. 1
  19. True
  20. run fans in empty rooms
  21. wastes electricity
  22. False
  23. use daylight to read
  24. 720
  25. leave fridge door open
  26. False
  27. 3
  28. wastes electricity
  29. True
  30. saves electricity
  31. 1170
  32. switch off empty rooms
  33. 16
  34. True
  35. False
  36. 595
  37. saves electricity
  38. 440
  39. False
  40. unplug idle chargers

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