Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 332 · 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 of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
2. 2.True or false: to use LED lamps wastes electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
15. 15.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
17. 17.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
19. 19.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
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 3 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.🧾 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?
30. 30.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
35. 35.True or false: to leave fridge door open wastes electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use daylight to read
37. 37.True or false: to leave fridge door open saves electricity. (a) True (b) False
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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