Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 458 · 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) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
2. 2.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) leave fridge door open
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
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.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) close the fridge quickly
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
18. 18.True or false: to switch off empty rooms saves electricity. (a) True (b) False
19. 19.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
27. 27.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
30. 30.🧾 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?
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
35. 35.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 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?
39. 39.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms

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