Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 272 · 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.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
4. 4.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
5. 5.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
8. 8.True or false: to use LED lamps saves electricity. (a) True (b) False
9. 9.True or false: to switch off empty rooms saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 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?
12. 12.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
18. 18.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
22. 22.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
25. 25.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
29. 29.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
31. 31.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
34. 34.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use old filament bulbs saves electricity. (a) False (b) True
38. 38.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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