Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 299 · 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 9 hours. How many watt-hours (Wh) are saved?
2. 2.True or false: to leave fridge door open saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
5. 5.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
6. 6.🧾 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?
7. 7.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
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.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
11. 11.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
15. 15.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
22. 22.True or false: to use daylight to read saves electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
24. 24.True or false: to use LED lamps wastes electricity. (a) False (b) True
25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
31. 31.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
32. 32.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
38. 38.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) iron one shirt at a time
39. 39.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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