Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 868 · 40 questions

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.

1. 1.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.True or false: to use daylight to read wastes electricity. (a) True (b) False
3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
5. 5.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
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.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.🧾 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?
16. 16.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
24. 24.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
26. 26.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) use daylight to read
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
30. 30.🧾 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?
31. 31.🧾 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?
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
34. 34.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to use old filament bulbs saves electricity. (a) True (b) False
37. 37.True or false: to use daylight to read saves electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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