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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 621 · 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) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
  2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  5. 5.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  6. 6.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  7. 7.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  8. 8.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
  9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
  10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
  12. 12.True or false: to switch off empty rooms saves electricity. (a) False (b) True
  13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  14. 14.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
  17. 17.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
  18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
  21. 21.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  22. 22.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  26. 26.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
  28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
  29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
  31. 31.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  32. 32.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
  34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  35. 35.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  37. 37.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use old filament bulbs (d) use LED lamps

Answer key

  1. use old filament bulbs
  2. wastes electricity
  3. 1 kilowatt-hour (kWh)
  4. saves electricity
  5. 0.8
  6. 1260
  7. False
  8. leave the TV on standby
  9. switch off empty rooms
  10. False
  11. an LED lamp
  12. True
  13. 680
  14. 8
  15. 2
  16. use daylight to read
  17. switch off empty rooms
  18. 1.6
  19. 950
  20. run fans in empty rooms
  21. 1400
  22. 1
  23. 850
  24. 126
  25. 1710
  26. False
  27. set the AC to 24 °C
  28. leave fridge door open
  29. 300
  30. close the fridge quickly
  31. True
  32. 0.8
  33. close the fridge quickly
  34. 700
  35. 1360
  36. 850
  37. 0.2
  38. wastes electricity
  39. wastes electricity
  40. use old filament bulbs

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