Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 804 · 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) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
3. 3.🧾 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?
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
9. 9.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
10. 10.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
17. 17.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
18. 18.True or false: to use old filament bulbs saves electricity. (a) False (b) True
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
20. 20.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) run fans in empty rooms
33. 33.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.True or false: to use daylight to read saves electricity. (a) False (b) True
35. 35.True or false: to unplug idle chargers saves electricity. (a) False (b) True
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms

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