Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 815 · 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.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
2. 2.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) close the fridge quickly (d) use daylight to read
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.🧾 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?
6. 6.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
7. 7.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
9. 9.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
12. 12.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
18. 18.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
20. 20.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to leave the TV on standby saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.True or false: to use LED lamps saves electricity. (a) False (b) True
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
36. 36.True or false: to use old filament bulbs saves electricity. (a) True (b) False
37. 37.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to leave fridge door open saves electricity. (a) True (b) False
39. 39.True or false: to unplug idle chargers saves electricity. (a) False (b) True
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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