Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 393 · 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 lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
5. 5.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
9. 9.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
10. 10.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 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?
13. 13.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
17. 17.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
18. 18.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use old filament bulbs saves electricity. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
26. 26.🧾 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?
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 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?
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
36. 36.True or false: to leave the TV on standby saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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