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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 988 · 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.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
  5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
  7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
  8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
  9. 9.🧾 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?
  10. 10.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
  11. 11.🧾 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?
  12. 12.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  13. 13.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
  14. 14.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  15. 15.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
  16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
  17. 17.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
  18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  19. 19.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  20. 20.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  21. 21.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  24. 24.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  25. 25.🧾 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?
  26. 26.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
  28. 28.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  29. 29.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
  30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
  33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  34. 34.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  35. 35.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  36. 36.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  38. 38.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
  40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity

Answer key

  1. 0.5
  2. saves electricity
  3. 238
  4. set the AC to 24 °C
  5. 459
  6. 136
  7. 1 kilowatt-hour (kWh)
  8. an LED lamp
  9. 63
  10. False
  11. 306
  12. 2.5
  13. leave the TV on standby
  14. True
  15. use LED lamps
  16. use daylight to read
  17. close the fridge quickly
  18. False
  19. 2
  20. True
  21. saves electricity
  22. wastes electricity
  23. wastes electricity
  24. 16
  25. 204
  26. False
  27. leave the TV on standby
  28. 1040
  29. use old filament bulbs
  30. saves electricity
  31. wastes electricity
  32. close the fridge quickly
  33. saves electricity
  34. False
  35. False
  36. 6
  37. 85
  38. False
  39. iron one shirt at a time
  40. wastes electricity

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