Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 609 · 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) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
2. 2.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
3. 3.💡 Does it save or waste electricity to use LED lamps? (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 5 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
8. 8.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to use LED lamps saves electricity. (a) True (b) False
11. 11.🧾 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?
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
16. 16.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
18. 18.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to switch off empty rooms saves electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
26. 26.🧾 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?
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
36. 36.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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