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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 230 · 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 wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
  2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
  3. 3.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
  4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
  5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
  7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  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 7 hours. How many watt-hours (Wh) are saved?
  9. 9.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  10. 10.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms
  11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  12. 12.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
  13. 13.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  15. 15.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
  19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  21. 21.🧾 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?
  22. 22.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  24. 24.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  28. 28.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  31. 31.🧾 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?
  32. 32.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) use LED lamps
  33. 33.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  35. 35.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.True or false: to use LED lamps wastes electricity. (a) False (b) True
  37. 37.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  40. 40.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True

Answer key

  1. leave the TV on standby
  2. use daylight to read
  3. use LED lamps
  4. close the fridge quickly
  5. set the AC to 24 °C
  6. unplug idle chargers
  7. 85
  8. 238
  9. True
  10. run fans in empty rooms
  11. saves electricity
  12. an LED lamp
  13. 10
  14. 600
  15. 4
  16. True
  17. saves electricity
  18. switch off empty rooms
  19. wastes electricity
  20. saves electricity
  21. 102
  22. 1 kilowatt-hour (kWh)
  23. saves electricity
  24. True
  25. 900
  26. 280
  27. 80
  28. False
  29. 1
  30. 1360
  31. 189
  32. iron one shirt at a time
  33. 1
  34. wastes electricity
  35. 1.25
  36. False
  37. True
  38. 840
  39. wastes electricity
  40. True

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