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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 229 · 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.True or false: to leave fridge door open saves electricity. (a) False (b) True
  2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
  4. 4.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  5. 5.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
  7. 7.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  8. 8.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
  10. 10.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
  12. 12.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
  13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  14. 14.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
  17. 17.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) run fans in empty rooms
  18. 18.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
  19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
  21. 21.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
  22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
  23. 23.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
  24. 24.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  25. 25.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
  26. 26.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
  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 7 hours. How many watt-hours (Wh) are saved?
  29. 29.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
  31. 31.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
  32. 32.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
  34. 34.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
  36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  37. 37.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
  39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

Answer key

  1. False
  2. wastes electricity
  3. 1 kilowatt-hour (kWh)
  4. 200
  5. 0.8
  6. leave the TV on standby
  7. 630
  8. 2
  9. set the AC to 24 °C
  10. 160
  11. iron one shirt at a time
  12. use LED lamps
  13. wastes electricity
  14. 20
  15. 2.5
  16. switch off empty rooms
  17. set the AC to 24 °C
  18. True
  19. False
  20. wastes electricity
  21. switch off empty rooms
  22. leave fridge door open
  23. an LED lamp
  24. 4
  25. unplug idle chargers
  26. 1600
  27. wastes electricity
  28. 441
  29. True
  30. use daylight to read
  31. True
  32. 1040
  33. use old filament bulbs
  34. False
  35. saves electricity
  36. wastes electricity
  37. 0.4
  38. 504
  39. 1260
  40. saves electricity

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