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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 290 · 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) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
  2. 2.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  3. 3.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
  4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
  5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
  6. 6.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  8. 8.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
  9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  12. 12.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
  15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  16. 16.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  19. 19.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
  22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
  23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
  25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
  26. 26.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
  27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
  28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  29. 29.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  30. 30.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  32. 32.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
  33. 33.True or false: to use daylight to read saves electricity. (a) False (b) True
  34. 34.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  36. 36.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  40. 40.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False

Answer key

  1. switch off empty rooms
  2. True
  3. use daylight to read
  4. 1 kilowatt-hour (kWh)
  5. an LED lamp
  6. 1.25
  7. 420
  8. use LED lamps
  9. wastes electricity
  10. False
  11. saves electricity
  12. True
  13. False
  14. use old filament bulbs
  15. wastes electricity
  16. 10
  17. True
  18. 204
  19. 5
  20. 3
  21. 170
  22. unplug idle chargers
  23. saves electricity
  24. set the AC to 24 °C
  25. close the fridge quickly
  26. run fans in empty rooms
  27. use old filament bulbs
  28. 306
  29. 2
  30. False
  31. 378
  32. unplug idle chargers
  33. True
  34. 1200
  35. wastes electricity
  36. 0.2
  37. 15
  38. False
  39. 425
  40. True

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