Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 24 · 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.True or false: to use LED lamps wastes electricity. (a) True (b) False
2. 2.🧾 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?
3. 3.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
6. 6.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
16. 16.True or false: to close the fridge quickly saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
19. 19.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
20. 20.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave the TV on standby saves electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
32. 32.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
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 3 hours. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
39. 39.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
40. 40.🧾 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?

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