Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 990 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
5. 5.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
6. 6.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
12. 12.True or false: to switch off empty rooms saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
26. 26.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.True or false: to use daylight to read wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
34. 34.🧾 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?
35. 35.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
39. 39.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 6 hours. How many watt-hours (Wh) are saved?

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