Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 451 · 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 old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
9. 9.🧾 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
10. 10.🔍 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) close the fridge quickly
11. 11.True or false: to leave fridge door open wastes electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
15. 15.🧾 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?
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
21. 21.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
22. 22.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 40 W filament bulb is swapped for a 6 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 use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.True or false: to use daylight to read wastes electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
32. 32.True or false: to use LED lamps wastes electricity. (a) False (b) True
33. 33.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) unplug idle chargers
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
38. 38.True or false: to unplug idle chargers saves electricity. (a) False (b) True
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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