Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 702 · 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 saves electricity. (a) True (b) False
2. 2.True or false: to leave the TV on standby saves electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use LED lamps (d) unplug idle chargers
5. 5.True or false: to use old filament bulbs saves electricity. (a) True (b) False
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 4 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
12. 12.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
14. 14.True or false: to use LED lamps wastes electricity. (a) True (b) False
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
16. 16.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
18. 18.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
19. 19.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
20. 20.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
21. 21.🧾 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?
22. 22.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 250 W appliance runs for 8 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 ₹8. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
35. 35.🧾 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?
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 7 hours. How many watt-hours (Wh) are saved?
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 6 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 75 W filament bulb is swapped for a 12 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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