Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 832 · 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
3. 3.True or false: to leave the TV on standby saves electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.True or false: to leave fridge door open saves electricity. (a) False (b) True
6. 6.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) close the fridge quickly
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
18. 18.🧾 A 75 W filament bulb is swapped for a 12 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) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) set the AC to 24 °C
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
27. 27.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
28. 28.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
29. 29.True or false: to unplug idle chargers saves electricity. (a) True (b) False
30. 30.🧾 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?
31. 31.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.True or false: to use daylight to read wastes electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
38. 38.True or false: to use LED lamps wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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