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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 903 · 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 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
  3. 3.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  5. 5.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) use old filament bulbs (d) run fans in empty rooms
  7. 7.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  8. 8.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  9. 9.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  10. 10.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) iron one shirt at a time
  12. 12.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
  13. 13.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
  14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
  15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
  17. 17.🧾 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?
  18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  20. 20.🧾 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?
  21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  23. 23.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  24. 24.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  27. 27.🧾 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?
  28. 28.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  29. 29.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  31. 31.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
  32. 32.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
  34. 34.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
  38. 38.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  39. 39.True or false: to leave fridge door open saves electricity. (a) False (b) True
  40. 40.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms

Answer key

  1. 4
  2. use daylight to read
  3. 800
  4. 1 kilowatt-hour (kWh)
  5. 0.4
  6. use LED lamps
  7. False
  8. 1190
  9. False
  10. 2
  11. iron one shirt at a time
  12. switch off empty rooms
  13. run fans in empty rooms
  14. use daylight to read
  15. saves electricity
  16. True
  17. 306
  18. wastes electricity
  19. wastes electricity
  20. 510
  21. saves electricity
  22. 20
  23. True
  24. False
  25. saves electricity
  26. 770
  27. 595
  28. True
  29. 0.4
  30. saves electricity
  31. an LED lamp
  32. 3
  33. unplug idle chargers
  34. 640
  35. 0.25
  36. 910
  37. use old filament bulbs
  38. 10
  39. False
  40. set the AC to 24 °C

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