Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 227 · 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 unplug idle chargers? (a) wastes electricity (b) saves electricity
2. 2.True or false: to use LED lamps saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
4. 4.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
12. 12.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
17. 17.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
21. 21.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
25. 25.🧾 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
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
28. 28.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
30. 30.True or false: to switch off empty rooms saves electricity. (a) True (b) False
31. 31.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
36. 36.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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