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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 589 · 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.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
  4. 4.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  5. 5.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
  6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  7. 7.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  8. 8.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
  9. 9.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  10. 10.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  11. 11.True or false: to use old filament bulbs saves electricity. (a) True (b) False
  12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
  13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
  14. 14.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
  15. 15.True or false: to use daylight to read wastes electricity. (a) False (b) True
  16. 16.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
  18. 18.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  19. 19.True or false: to use LED lamps wastes electricity. (a) False (b) True
  20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  21. 21.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
  25. 25.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  26. 26.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
  27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
  28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  29. 29.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
  30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
  31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
  32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
  36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
  37. 37.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
  38. 38.True or false: to use daylight to read saves electricity. (a) True (b) False
  39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

Answer key

  1. 6
  2. saves electricity
  3. an LED lamp
  4. True
  5. use old filament bulbs
  6. 450
  7. True
  8. set the AC to 24 °C
  9. 1 kilowatt-hour (kWh)
  10. 720
  11. False
  12. use daylight to read
  13. wastes electricity
  14. use LED lamps
  15. False
  16. 0.6
  17. use daylight to read
  18. 1
  19. False
  20. saves electricity
  21. 0.3
  22. 350
  23. 204
  24. close the fridge quickly
  25. 2
  26. unplug idle chargers
  27. leave fridge door open
  28. saves electricity
  29. True
  30. False
  31. saves electricity
  32. 272
  33. saves electricity
  34. 315
  35. use LED lamps
  36. set the AC to 24 °C
  37. False
  38. True
  39. saves electricity
  40. 1040

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