Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 21 · 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.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
4. 4.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
5. 5.True or false: to switch off empty rooms saves electricity. (a) True (b) False
6. 6.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
7. 7.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
9. 9.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
11. 11.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.True or false: to leave the TV on standby saves electricity. (a) True (b) False
19. 19.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
20. 20.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to use old filament bulbs saves electricity. (a) False (b) True
23. 23.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.🧾 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?
38. 38.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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