Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 30 · 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 unplug idle chargers? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.🧾 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?
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.True or false: to use LED lamps saves electricity. (a) True (b) False
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
8. 8.True or false: to use LED lamps wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
13. 13.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
14. 14.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
16. 16.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
17. 17.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 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?
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
21. 21.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🧾 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?
27. 27.🧾 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?
28. 28.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
32. 32.🧾 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?
33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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