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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 249 · 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) an oil lamp (d) a filament bulb
  2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  4. 4.True or false: to use daylight to read wastes electricity. (a) False (b) True
  5. 5.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
  7. 7.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
  9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) leave fridge door open
  10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
  12. 12.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
  14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
  15. 15.True or false: to unplug idle chargers saves electricity. (a) True (b) False
  16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
  17. 17.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  18. 18.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  19. 19.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
  21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  22. 22.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
  23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
  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 3 hours. How many watt-hours (Wh) are saved?
  26. 26.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  27. 27.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
  28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  29. 29.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  30. 30.🧾 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?
  31. 31.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
  35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  37. 37.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
  40. 40.True or false: to leave the TV on standby saves electricity. (a) False (b) True

Answer key

  1. an LED lamp
  2. use old filament bulbs
  3. saves electricity
  4. False
  5. 2
  6. use old filament bulbs
  7. 240
  8. leave the TV on standby
  9. leave fridge door open
  10. 680
  11. saves electricity
  12. 1200
  13. saves electricity
  14. set the AC to 24 °C
  15. True
  16. wastes electricity
  17. False
  18. 0.5
  19. 6
  20. unplug idle chargers
  21. False
  22. run fans in empty rooms
  23. wastes electricity
  24. iron one shirt at a time
  25. 102
  26. 4
  27. use LED lamps
  28. 567
  29. 1 kilowatt-hour (kWh)
  30. 238
  31. 1710
  32. saves electricity
  33. saves electricity
  34. False
  35. 441
  36. 0.5
  37. 1.25
  38. 1440
  39. close the fridge quickly
  40. False

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