Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 317 · 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 of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) set the AC to 24 °C
2. 2.True or false: to leave fridge door open wastes electricity. (a) True (b) False
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
5. 5.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
10. 10.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
12. 12.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
14. 14.🧾 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?
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
24. 24.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 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?
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.🧾 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?
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.🧾 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?
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
40. 40.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time

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