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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 244 · 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.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
  2. 2.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
  5. 5.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  7. 7.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
  10. 10.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
  11. 11.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
  13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
  16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  19. 19.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  20. 20.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  21. 21.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  23. 23.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  25. 25.True or false: to use LED lamps saves electricity. (a) False (b) True
  26. 26.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  27. 27.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 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?
  29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  31. 31.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) close the fridge quickly
  34. 34.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  38. 38.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  39. 39.True or false: to use daylight to read wastes electricity. (a) True (b) False
  40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms

Answer key

  1. unplug idle chargers
  2. False
  3. saves electricity
  4. leave the TV on standby
  5. False
  6. saves electricity
  7. False
  8. 68
  9. use LED lamps
  10. use LED lamps
  11. 1 kilowatt-hour (kWh)
  12. set the AC to 24 °C
  13. an LED lamp
  14. wastes electricity
  15. switch off empty rooms
  16. saves electricity
  17. 150
  18. saves electricity
  19. 980
  20. False
  21. 0.4
  22. 960
  23. 1040
  24. 153
  25. True
  26. False
  27. 0.5
  28. 441
  29. 238
  30. 960
  31. 8
  32. saves electricity
  33. leave fridge door open
  34. 0.6
  35. wastes electricity
  36. 12
  37. 255
  38. True
  39. False
  40. use old filament bulbs

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