Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 440 · 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.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
2. 2.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) use old filament bulbs
7. 7.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
9. 9.🧾 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?
10. 10.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
13. 13.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to use daylight to read wastes electricity. (a) False (b) True
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 8 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
18. 18.True or false: to use LED lamps saves electricity. (a) False (b) True
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to use old filament bulbs saves electricity. (a) True (b) False
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
23. 23.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
25. 25.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
27. 27.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.🧾 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?
31. 31.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to unplug idle chargers saves electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

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