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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 884 · 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 wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
  2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
  3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
  4. 4.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  5. 5.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  6. 6.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
  7. 7.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  8. 8.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
  9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
  11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
  13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
  14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
  15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
  16. 16.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  17. 17.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  18. 18.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  19. 19.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  22. 22.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  24. 24.True or false: to use LED lamps wastes electricity. (a) True (b) False
  25. 25.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  27. 27.🧾 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?
  28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  29. 29.True or false: to leave fridge door open wastes electricity. (a) False (b) True
  30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
  33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  34. 34.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  35. 35.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
  36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
  37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
  38. 38.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

Answer key

  1. run fans in empty rooms
  2. iron one shirt at a time
  3. an LED lamp
  4. 1
  5. 900
  6. iron one shirt at a time
  7. 0.4
  8. False
  9. 540
  10. leave the TV on standby
  11. wastes electricity
  12. set the AC to 24 °C
  13. 1 kilowatt-hour (kWh)
  14. switch off empty rooms
  15. run fans in empty rooms
  16. 800
  17. False
  18. True
  19. 0.5
  20. 420
  21. saves electricity
  22. 550
  23. 950
  24. False
  25. 1
  26. False
  27. 85
  28. saves electricity
  29. True
  30. 5
  31. 1200
  32. leave fridge door open
  33. True
  34. 6
  35. False
  36. close the fridge quickly
  37. True
  38. True
  39. 1260
  40. True

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