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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 570 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
  2. 2.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  4. 4.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
  6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) switch off empty rooms (d) use daylight to read
  8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
  10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
  11. 11.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  12. 12.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
  15. 15.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
  17. 17.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
  18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  19. 19.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  20. 20.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
  21. 21.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
  22. 22.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
  23. 23.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
  24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  25. 25.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  27. 27.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
  29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
  30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
  31. 31.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  32. 32.🧾 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?
  33. 33.True or false: to leave fridge door open wastes electricity. (a) True (b) False
  34. 34.True or false: to use daylight to read wastes electricity. (a) False (b) True
  35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
  36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  37. 37.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  38. 38.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?

Answer key

  1. 1 kilowatt-hour (kWh)
  2. 1.6
  3. 480
  4. 3
  5. use old filament bulbs
  6. wastes electricity
  7. use old filament bulbs
  8. saves electricity
  9. switch off empty rooms
  10. an LED lamp
  11. True
  12. 0.8
  13. 16
  14. iron one shirt at a time
  15. saves electricity
  16. close the fridge quickly
  17. use LED lamps
  18. 378
  19. 0.4
  20. 320
  21. leave the TV on standby
  22. set the AC to 24 °C
  23. True
  24. 51
  25. False
  26. saves electricity
  27. 80
  28. use daylight to read
  29. use LED lamps
  30. leave fridge door open
  31. 4
  32. 85
  33. True
  34. False
  35. 1620
  36. 250
  37. 0.3
  38. 12
  39. wastes electricity
  40. 425

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