Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 480 · 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 is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
15. 15.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
20. 20.True or false: to use LED lamps saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
32. 32.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
35. 35.🧾 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?
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
38. 38.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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