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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 986 · 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 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
  2. 2.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
  4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
  6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
  7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
  10. 10.🧾 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?
  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 3 hours. How many watt-hours (Wh) are saved?
  12. 12.True or false: to use LED lamps saves electricity. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
  14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  15. 15.True or false: to use daylight to read wastes electricity. (a) True (b) False
  16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
  17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
  20. 20.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  21. 21.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
  22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  23. 23.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  24. 24.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
  25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
  26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  27. 27.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  28. 28.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  29. 29.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.🧾 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?
  31. 31.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  32. 32.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  33. 33.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  34. 34.True or false: to use daylight to read saves electricity. (a) False (b) True
  35. 35.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  36. 36.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  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 3 hours. How many watt-hours (Wh) are saved?
  38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
  39. 39.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 8
  3. an LED lamp
  4. 1050
  5. use LED lamps
  6. wastes electricity
  7. 630
  8. wastes electricity
  9. run fans in empty rooms
  10. 306
  11. 153
  12. True
  13. use LED lamps
  14. wastes electricity
  15. False
  16. 340
  17. saves electricity
  18. 990
  19. use daylight to read
  20. 0.8
  21. False
  22. 10
  23. saves electricity
  24. use daylight to read
  25. run fans in empty rooms
  26. 250
  27. 2
  28. 7.5
  29. 660
  30. 51
  31. 20
  32. False
  33. 0.6
  34. True
  35. 0.5
  36. switch off empty rooms
  37. 255
  38. iron one shirt at a time
  39. 2
  40. 0.2

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