Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 324 · 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.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
7. 7.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
8. 8.🧾 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?
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
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 9 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
21. 21.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 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?
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
28. 28.True or false: to close the fridge quickly saves electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
31. 31.True or false: to use LED lamps saves electricity. (a) False (b) True
32. 32.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) run fans in empty rooms
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to iron one shirt at a time saves 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 10 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)

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