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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 852 · 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 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
  2. 2.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
  3. 3.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
  4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
  5. 5.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
  6. 6.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
  9. 9.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  10. 10.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
  11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
  12. 12.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
  14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
  15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
  16. 16.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
  17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  18. 18.True or false: to leave the TV on standby saves electricity. (a) False (b) True
  19. 19.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  20. 20.True or false: to close the fridge quickly saves electricity. (a) False (b) True
  21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  22. 22.🧾 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?
  23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
  24. 24.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  25. 25.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
  28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
  29. 29.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
  30. 30.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
  32. 32.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  33. 33.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  34. 34.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
  35. 35.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
  36. 36.True or false: to use LED lamps saves electricity. (a) True (b) False
  37. 37.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
  38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
  40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

Answer key

  1. 1 kilowatt-hour (kWh)
  2. use LED lamps
  3. close the fridge quickly
  4. unplug idle chargers
  5. switch off empty rooms
  6. 0.3
  7. 200
  8. use daylight to read
  9. 8
  10. True
  11. saves electricity
  12. 980
  13. run fans in empty rooms
  14. saves electricity
  15. wastes electricity
  16. True
  17. wastes electricity
  18. False
  19. 20
  20. True
  21. saves electricity
  22. 85
  23. leave the TV on standby
  24. 1
  25. 10
  26. 360
  27. 34
  28. True
  29. run fans in empty rooms
  30. 1.25
  31. use LED lamps
  32. 0.2
  33. 1
  34. leave fridge door open
  35. set the AC to 24 °C
  36. True
  37. an LED lamp
  38. wastes electricity
  39. wastes electricity
  40. 630

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