Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 696 · 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 daylight to read? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
3. 3.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
4. 4.True or false: to switch off empty rooms saves electricity. (a) False (b) True
5. 5.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) close the fridge quickly
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
12. 12.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
18. 18.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
21. 21.True or false: to leave the TV on standby saves electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
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 4 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 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?
26. 26.🧾 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?
27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
35. 35.🧾 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?
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 5 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) use daylight to read

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