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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 185 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  2. 2.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
  5. 5.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  6. 6.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
  7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
  8. 8.🧾 A family uses 170 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 the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
  10. 10.True or false: to use daylight to read wastes electricity. (a) True (b) False
  11. 11.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
  12. 12.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  13. 13.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  14. 14.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  18. 18.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
  19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  21. 21.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  22. 22.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
  24. 24.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
  25. 25.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  26. 26.True or false: to use daylight to read saves electricity. (a) True (b) False
  27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
  28. 28.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  29. 29.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
  30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
  33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
  34. 34.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  35. 35.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  37. 37.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  39. 39.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 10
  3. 810
  4. leave the TV on standby
  5. saves electricity
  6. use old filament bulbs
  7. an LED lamp
  8. 680
  9. switch off empty rooms
  10. False
  11. leave fridge door open
  12. 300
  13. 7.5
  14. 1.6
  15. 510
  16. 408
  17. 51
  18. leave the TV on standby
  19. 204
  20. saves electricity
  21. 1.5
  22. True
  23. set the AC to 24 °C
  24. unplug idle chargers
  25. False
  26. True
  27. iron one shirt at a time
  28. 1
  29. set the AC to 24 °C
  30. True
  31. wastes electricity
  32. use LED lamps
  33. True
  34. 1
  35. 1
  36. 720
  37. 4
  38. 0.1
  39. 0.5
  40. unplug idle chargers

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