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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 413 · 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 family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
  3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
  4. 4.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
  5. 5.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  7. 7.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
  9. 9.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
  10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  11. 11.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
  12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
  13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
  14. 14.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
  17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
  19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  20. 20.🧾 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?
  21. 21.True or false: to switch off empty rooms saves electricity. (a) True (b) False
  22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  23. 23.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
  25. 25.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) use old filament bulbs
  26. 26.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
  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 4 hours. How many watt-hours (Wh) are saved?
  28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
  30. 30.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
  33. 33.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity

Answer key

  1. 840
  2. an LED lamp
  3. False
  4. True
  5. 0.5
  6. 1 kilowatt-hour (kWh)
  7. 2
  8. use LED lamps
  9. switch off empty rooms
  10. 210
  11. unplug idle chargers
  12. leave fridge door open
  13. leave the TV on standby
  14. False
  15. 440
  16. switch off empty rooms
  17. 910
  18. use old filament bulbs
  19. 441
  20. 306
  21. True
  22. 1440
  23. 0.2
  24. close the fridge quickly
  25. use old filament bulbs
  26. leave the TV on standby
  27. 340
  28. 8
  29. set the AC to 24 °C
  30. 16
  31. saves electricity
  32. use LED lamps
  33. True
  34. wastes electricity
  35. 0.25
  36. 1.5
  37. 150
  38. 680
  39. 0.3
  40. saves electricity

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