Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 698 · 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.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
6. 6.True or false: to leave fridge door open wastes electricity. (a) True (b) False
7. 7.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
8. 8.True or false: to switch off empty rooms saves electricity. (a) True (b) False
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
10. 10.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 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?
18. 18.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
21. 21.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
23. 23.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
26. 26.True or false: to use LED lamps wastes electricity. (a) False (b) True
27. 27.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
28. 28.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
37. 37.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False

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