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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 366 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  2. 2.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
  3. 3.🧾 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
  4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
  5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
  6. 6.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
  7. 7.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  8. 8.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
  9. 9.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  10. 10.True or false: to use old filament bulbs saves electricity. (a) False (b) True
  11. 11.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
  13. 13.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  15. 15.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  17. 17.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  19. 19.True or false: to leave fridge door open saves electricity. (a) False (b) True
  20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  22. 22.True or false: to use LED lamps wastes electricity. (a) True (b) False
  23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
  24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  25. 25.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  26. 26.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
  27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  28. 28.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
  29. 29.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
  31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  32. 32.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  34. 34.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) run fans in empty rooms
  36. 36.True or false: to close the fridge quickly saves electricity. (a) True (b) False
  37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  38. 38.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. saves electricity
  2. use old filament bulbs
  3. an LED lamp
  4. use LED lamps
  5. unplug idle chargers
  6. run fans in empty rooms
  7. saves electricity
  8. iron one shirt at a time
  9. True
  10. False
  11. 2.5
  12. 1 kilowatt-hour (kWh)
  13. 4
  14. wastes electricity
  15. 7.5
  16. saves electricity
  17. 6
  18. 8
  19. False
  20. wastes electricity
  21. 450
  22. False
  23. use LED lamps
  24. close the fridge quickly
  25. 2
  26. set the AC to 24 °C
  27. True
  28. iron one shirt at a time
  29. 0.5
  30. leave fridge door open
  31. False
  32. 440
  33. 700
  34. 12
  35. run fans in empty rooms
  36. True
  37. False
  38. 2
  39. 6
  40. 1.5

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