Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 742 · 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 old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
16. 16.🧾 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?
17. 17.True or false: to leave fridge door open wastes electricity. (a) False (b) True
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
19. 19.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
20. 20.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
26. 26.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
27. 27.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
32. 32.True or false: to switch off empty rooms saves electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
35. 35.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
37. 37.True or false: to leave fridge door open saves electricity. (a) False (b) True
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

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