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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 771 · 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) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) set the AC to 24 °C
  2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
  3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  5. 5.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  7. 7.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  8. 8.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
  10. 10.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  11. 11.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
  13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
  15. 15.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  17. 17.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  19. 19.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
  21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  22. 22.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
  23. 23.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  25. 25.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
  27. 27.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  28. 28.🧾 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?
  29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
  31. 31.🧾 A 100 W filament bulb is swapped for a 15 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 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  33. 33.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  34. 34.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
  36. 36.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  37. 37.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  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 run fans in empty rooms wastes electricity. (a) True (b) False
  40. 40.True or false: to use LED lamps wastes electricity. (a) False (b) True

Answer key

  1. leave the TV on standby
  2. use LED lamps
  3. wastes electricity
  4. an LED lamp
  5. False
  6. saves electricity
  7. 12
  8. 600
  9. True
  10. True
  11. 15
  12. run fans in empty rooms
  13. wastes electricity
  14. iron one shirt at a time
  15. 1000
  16. saves electricity
  17. 0.8
  18. 2
  19. True
  20. iron one shirt at a time
  21. 350
  22. set the AC to 24 °C
  23. 1 kilowatt-hour (kWh)
  24. 350
  25. 5
  26. unplug idle chargers
  27. 1350
  28. 510
  29. 600
  30. switch off empty rooms
  31. 850
  32. 1
  33. saves electricity
  34. 0.4
  35. close the fridge quickly
  36. 12
  37. False
  38. 10
  39. True
  40. False

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