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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 311 · 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 6 hours. How many units (kWh) of electricity does it use? =
  2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  3. 3.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  4. 4.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  5. 5.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  6. 6.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
  7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
  9. 9.True or false: to leave fridge door open saves electricity. (a) False (b) True
  10. 10.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  12. 12.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  13. 13.True or false: to use LED lamps saves electricity. (a) False (b) True
  14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  16. 16.🧾 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?
  17. 17.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
  18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
  20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
  22. 22.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
  23. 23.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
  24. 24.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  25. 25.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  26. 26.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
  27. 27.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  28. 28.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
  29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
  32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
  35. 35.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  38. 38.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  39. 39.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

Answer key

  1. 0.6
  2. 595
  3. True
  4. 12
  5. unplug idle chargers
  6. run fans in empty rooms
  7. False
  8. 1 kilowatt-hour (kWh)
  9. False
  10. saves electricity
  11. 400
  12. 160
  13. True
  14. saves electricity
  15. False
  16. 189
  17. use old filament bulbs
  18. wastes electricity
  19. leave fridge door open
  20. True
  21. iron one shirt at a time
  22. switch off empty rooms
  23. close the fridge quickly
  24. 2
  25. 3
  26. use daylight to read
  27. 160
  28. an LED lamp
  29. saves electricity
  30. 1260
  31. iron one shirt at a time
  32. True
  33. 136
  34. set the AC to 24 °C
  35. True
  36. saves electricity
  37. 650
  38. False
  39. True
  40. 630

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