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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 838 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
  3. 3.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  5. 5.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
  7. 7.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
  10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  11. 11.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
  12. 12.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  13. 13.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
  14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
  15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) run fans in empty rooms
  17. 17.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
  18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  19. 19.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
  21. 21.🧾 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?
  22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
  24. 24.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  25. 25.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) use daylight to read
  26. 26.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
  27. 27.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  28. 28.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) use daylight to read
  29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
  30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  32. 32.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
  38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
  39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  40. 40.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1 kilowatt-hour (kWh)
  2. an LED lamp
  3. 6
  4. saves electricity
  5. False
  6. use daylight to read
  7. True
  8. 378
  9. use LED lamps
  10. False
  11. set the AC to 24 °C
  12. True
  13. leave fridge door open
  14. iron one shirt at a time
  15. saves electricity
  16. run fans in empty rooms
  17. switch off empty rooms
  18. saves electricity
  19. True
  20. switch off empty rooms
  21. 34
  22. saves electricity
  23. use daylight to read
  24. False
  25. run fans in empty rooms
  26. iron one shirt at a time
  27. True
  28. use old filament bulbs
  29. unplug idle chargers
  30. 520
  31. False
  32. False
  33. wastes electricity
  34. saves electricity
  35. wastes electricity
  36. wastes electricity
  37. False
  38. close the fridge quickly
  39. 450
  40. 15

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