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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 928 · 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 saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
  3. 3.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  6. 6.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  7. 7.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  8. 8.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
  10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) close the fridge quickly
  11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  12. 12.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
  15. 15.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
  16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
  17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
  19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  20. 20.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
  21. 21.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
  22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  23. 23.True or false: to use LED lamps wastes electricity. (a) True (b) False
  24. 24.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
  25. 25.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
  26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  27. 27.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  28. 28.💡 Does it save or waste electricity to switch off empty rooms? (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) close the fridge quickly (d) use old filament bulbs
  30. 30.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
  32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  35. 35.True or false: to use daylight to read saves electricity. (a) False (b) True
  36. 36.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  39. 39.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  40. 40.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

Answer key

  1. use LED lamps
  2. an LED lamp
  3. 0.8
  4. 357
  5. saves electricity
  6. 7.5
  7. False
  8. 160
  9. leave fridge door open
  10. iron one shirt at a time
  11. wastes electricity
  12. True
  13. 189
  14. leave the TV on standby
  15. set the AC to 24 °C
  16. use daylight to read
  17. False
  18. set the AC to 24 °C
  19. 120
  20. iron one shirt at a time
  21. run fans in empty rooms
  22. saves electricity
  23. False
  24. close the fridge quickly
  25. 1 kilowatt-hour (kWh)
  26. wastes electricity
  27. False
  28. saves electricity
  29. use old filament bulbs
  30. True
  31. close the fridge quickly
  32. 120
  33. wastes electricity
  34. True
  35. True
  36. 1330
  37. saves electricity
  38. wastes electricity
  39. saves electricity
  40. 720

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