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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 629 · 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 is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
  2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  4. 4.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
  6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  7. 7.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
  10. 10.🧾 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?
  11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  14. 14.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  15. 15.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
  17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read
  18. 18.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
  20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
  21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  22. 22.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
  23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
  25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
  27. 27.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
  31. 31.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  32. 32.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
  34. 34.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
  35. 35.True or false: to leave fridge door open saves electricity. (a) True (b) False
  36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  37. 37.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms
  38. 38.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. switch off empty rooms
  2. saves electricity
  3. 1 kilowatt-hour (kWh)
  4. True
  5. leave fridge door open
  6. saves electricity
  7. False
  8. 240
  9. switch off empty rooms
  10. 68
  11. wastes electricity
  12. 1
  13. False
  14. 1050
  15. True
  16. use LED lamps
  17. use old filament bulbs
  18. 0.4
  19. use old filament bulbs
  20. run fans in empty rooms
  21. True
  22. an LED lamp
  23. wastes electricity
  24. set the AC to 24 °C
  25. saves electricity
  26. leave fridge door open
  27. 3
  28. saves electricity
  29. saves electricity
  30. use daylight to read
  31. 0.4
  32. set the AC to 24 °C
  33. leave the TV on standby
  34. use LED lamps
  35. False
  36. saves electricity
  37. run fans in empty rooms
  38. 6
  39. 10
  40. 0.2

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