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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 981 · 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 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  2. 2.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
  3. 3.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  4. 4.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
  7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  8. 8.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  10. 10.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  11. 11.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
  12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
  13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
  15. 15.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  16. 16.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
  19. 19.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  21. 21.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 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?
  23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
  24. 24.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  25. 25.True or false: to use LED lamps wastes electricity. (a) True (b) False
  26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
  27. 27.🧾 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?
  28. 28.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.🧾 A family uses 40 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) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
  31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
  32. 32.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
  33. 33.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  34. 34.🧾 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?
  35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
  36. 36.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
  39. 39.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms

Answer key

  1. 0.2
  2. switch off empty rooms
  3. False
  4. 5
  5. 770
  6. use daylight to read
  7. 1400
  8. 12
  9. saves electricity
  10. 12
  11. run fans in empty rooms
  12. 1 kilowatt-hour (kWh)
  13. wastes electricity
  14. an LED lamp
  15. 1
  16. 4
  17. wastes electricity
  18. use old filament bulbs
  19. 8
  20. 800
  21. 7.5
  22. 340
  23. False
  24. 1350
  25. False
  26. iron one shirt at a time
  27. 306
  28. 200
  29. 160
  30. run fans in empty rooms
  31. leave the TV on standby
  32. unplug idle chargers
  33. True
  34. 510
  35. use LED lamps
  36. True
  37. 102
  38. unplug idle chargers
  39. 680
  40. iron one shirt at a time

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