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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 558 · 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) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
  2. 2.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
  4. 4.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  5. 5.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
  6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
  7. 7.True or false: to use daylight to read saves electricity. (a) False (b) True
  8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
  9. 9.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
  11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  12. 12.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
  13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
  14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
  15. 15.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  16. 16.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
  18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs
  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 4 hours. How many watt-hours (Wh) are saved?
  21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
  23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  24. 24.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  25. 25.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
  29. 29.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  31. 31.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  32. 32.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
  33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
  34. 34.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
  37. 37.True or false: to leave fridge door open saves electricity. (a) True (b) False
  38. 38.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
  39. 39.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

Answer key

  1. unplug idle chargers
  2. 990
  3. saves electricity
  4. 2
  5. False
  6. an LED lamp
  7. True
  8. 1 kilowatt-hour (kWh)
  9. 4
  10. True
  11. wastes electricity
  12. run fans in empty rooms
  13. leave fridge door open
  14. False
  15. False
  16. 2
  17. use old filament bulbs
  18. wastes electricity
  19. set the AC to 24 °C
  20. 204
  21. wastes electricity
  22. unplug idle chargers
  23. saves electricity
  24. saves electricity
  25. 7.5
  26. 34
  27. wastes electricity
  28. switch off empty rooms
  29. 3
  30. False
  31. 640
  32. use old filament bulbs
  33. close the fridge quickly
  34. 9
  35. True
  36. run fans in empty rooms
  37. False
  38. iron one shirt at a time
  39. 1
  40. False

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