Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 167 · 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) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) iron one shirt at a time
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
3. 3.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
6. 6.True or false: to use old filament bulbs saves electricity. (a) False (b) True
7. 7.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
9. 9.🧾 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?
10. 10.🧾 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?
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
12. 12.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
13. 13.True or false: to leave fridge door open saves electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
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 5 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) set the AC to 24 °C
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 2 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 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to use LED lamps wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
40. 40.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) run fans in empty rooms (d) close the fridge quickly

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