Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 337 · 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 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?
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
5. 5.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
10. 10.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
13. 13.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.🧾 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?
15. 15.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
20. 20.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🧾 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?
27. 27.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
29. 29.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
31. 31.True or false: to leave the TV on standby saves electricity. (a) False (b) True
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
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 1 hour. How many watt-hours (Wh) are saved?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🧾 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?
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 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?
39. 39.True or false: to use daylight to read saves electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly

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