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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 153 · 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 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
  3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
  5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
  7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  8. 8.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
  9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  10. 10.True or false: to leave fridge door open saves electricity. (a) False (b) True
  11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  12. 12.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
  13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  16. 16.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
  21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
  22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
  26. 26.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  29. 29.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  30. 30.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
  32. 32.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  33. 33.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  37. 37.True or false: to use daylight to read saves electricity. (a) True (b) False
  38. 38.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
  39. 39.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

Answer key

  1. 4
  2. run fans in empty rooms
  3. saves electricity
  4. use old filament bulbs
  5. 550
  6. 1 kilowatt-hour (kWh)
  7. 1710
  8. set the AC to 24 °C
  9. set the AC to 24 °C
  10. False
  11. wastes electricity
  12. switch off empty rooms
  13. 306
  14. wastes electricity
  15. 2
  16. 5
  17. 400
  18. saves electricity
  19. saves electricity
  20. run fans in empty rooms
  21. leave fridge door open
  22. 280
  23. 540
  24. 340
  25. use old filament bulbs
  26. True
  27. saves electricity
  28. 240
  29. False
  30. True
  31. leave the TV on standby
  32. 420
  33. 0.5
  34. True
  35. wastes electricity
  36. 0.4
  37. True
  38. iron one shirt at a time
  39. saves electricity
  40. 850

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