Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 467 · 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.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
11. 11.True or false: to use LED lamps wastes electricity. (a) False (b) True
12. 12.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) close the fridge quickly
17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
26. 26.True or false: to switch off empty rooms saves electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
28. 28.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
29. 29.True or false: to use LED lamps saves electricity. (a) False (b) True
30. 30.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 160 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 4 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
40. 40.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) use LED lamps

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