Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 66 · 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) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
2. 2.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
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 3 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
16. 16.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) unplug idle chargers
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
22. 22.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
24. 24.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) switch off empty rooms
27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use old filament bulbs saves electricity. (a) False (b) True
30. 30.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
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 6 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
36. 36.True or false: to leave fridge door open saves electricity. (a) False (b) True
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
38. 38.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs

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