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Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 333 · 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 run fans in empty rooms wastes electricity. (a) False (b) True
  2. 2.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  3. 3.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
  4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
  5. 5.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
  6. 6.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
  8. 8.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  9. 9.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
  10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  11. 11.🧾 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
  12. 12.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
  14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
  15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
  16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
  17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
  18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
  19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
  20. 20.True or false: to use daylight to read saves electricity. (a) True (b) False
  21. 21.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  22. 22.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  23. 23.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
  24. 24.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  25. 25.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
  26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
  27. 27.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
  29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  30. 30.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
  31. 31.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
  33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
  34. 34.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
  35. 35.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
  37. 37.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  38. 38.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
  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 2 hours. How many watt-hours (Wh) are saved?

Answer key

  1. True
  2. 10
  3. 16
  4. wastes electricity
  5. use LED lamps
  6. 120
  7. saves electricity
  8. 4
  9. False
  10. 240
  11. an LED lamp
  12. 6
  13. 255
  14. 1 kilowatt-hour (kWh)
  15. 357
  16. unplug idle chargers
  17. run fans in empty rooms
  18. set the AC to 24 °C
  19. False
  20. True
  21. 4
  22. 320
  23. close the fridge quickly
  24. 360
  25. unplug idle chargers
  26. leave fridge door open
  27. 0.4
  28. run fans in empty rooms
  29. 1000
  30. set the AC to 24 °C
  31. 630
  32. leave the TV on standby
  33. 306
  34. iron one shirt at a time
  35. 20
  36. wastes electricity
  37. 2.5
  38. False
  39. wastes electricity
  40. 170

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