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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 502 · 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 lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
  2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
  3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  4. 4.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
  5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
  6. 6.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) use daylight to read
  7. 7.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  8. 8.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
  10. 10.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
  15. 15.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
  16. 16.🧾 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?
  17. 17.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  18. 18.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
  20. 20.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
  21. 21.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
  25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
  26. 26.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) use daylight to read
  27. 27.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
  29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  30. 30.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  31. 31.True or false: to use daylight to read wastes electricity. (a) True (b) False
  32. 32.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
  33. 33.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
  34. 34.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
  35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
  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 1 hour. How many watt-hours (Wh) are saved?
  37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
  38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open

Answer key

  1. an LED lamp
  2. 1 kilowatt-hour (kWh)
  3. False
  4. use old filament bulbs
  5. True
  6. iron one shirt at a time
  7. True
  8. 200
  9. saves electricity
  10. 0.6
  11. saves electricity
  12. 2.5
  13. 4
  14. run fans in empty rooms
  15. leave the TV on standby
  16. 170
  17. 1200
  18. 6
  19. iron one shirt at a time
  20. False
  21. 1.5
  22. 4
  23. wastes electricity
  24. leave fridge door open
  25. run fans in empty rooms
  26. use daylight to read
  27. 1
  28. use old filament bulbs
  29. wastes electricity
  30. True
  31. False
  32. leave fridge door open
  33. False
  34. set the AC to 24 °C
  35. switch off empty rooms
  36. 85
  37. leave the TV on standby
  38. saves electricity
  39. 1140
  40. use LED lamps

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