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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 215 · 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) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
  2. 2.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
  6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
  7. 7.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
  10. 10.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  12. 12.🧾 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?
  13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  15. 15.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
  17. 17.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
  19. 19.True or false: to leave fridge door open saves electricity. (a) False (b) True
  20. 20.🧾 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?
  21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
  22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  23. 23.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
  24. 24.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
  27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
  28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
  30. 30.True or false: to leave fridge door open wastes 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.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  34. 34.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
  35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  36. 36.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
  37. 37.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
  40. 40.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

Answer key

  1. set the AC to 24 °C
  2. 2
  3. 6
  4. 180
  5. switch off empty rooms
  6. an LED lamp
  7. True
  8. 1 kilowatt-hour (kWh)
  9. leave the TV on standby
  10. 1530
  11. 240
  12. 204
  13. 630
  14. 510
  15. 2
  16. True
  17. 8
  18. leave the TV on standby
  19. False
  20. 153
  21. run fans in empty rooms
  22. saves electricity
  23. close the fridge quickly
  24. 0.2
  25. saves electricity
  26. leave fridge door open
  27. close the fridge quickly
  28. 270
  29. iron one shirt at a time
  30. True
  31. wastes electricity
  32. 0.2
  33. 357
  34. leave fridge door open
  35. 63
  36. iron one shirt at a time
  37. 4
  38. 1
  39. use daylight to read
  40. 700

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