Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 421 · 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 LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
6. 6.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
10. 10.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
17. 17.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
18. 18.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
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.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
23. 23.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 1 hour. How many watt-hours (Wh) are saved?
25. 25.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
29. 29.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.True or false: to leave fridge door open wastes electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
33. 33.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
34. 34.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?

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