Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 404 · 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 leave the TV on standby wastes electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
3. 3.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 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?
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
13. 13.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
16. 16.True or false: to use LED lamps wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
19. 19.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
20. 20.True or false: to use daylight to read saves electricity. (a) False (b) True
21. 21.True or false: to use daylight to read wastes electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
23. 23.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
24. 24.🧾 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?
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
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 4 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
30. 30.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
31. 31.True or false: to leave fridge door open wastes electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 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?
39. 39.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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